Standard Lemma guide

meltdown

noun · 10 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /ˈmɛltdaʊn/
  • British, Southern, Standard: /ˈmɛltdawn/
  • General-American: /ˈmɛltˌdaʊn/
  • General-American: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: M EH1 L T D AW2 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

An act or process of melting.

Definition source: English Wiktionary via Wiktextract

Usage: countable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

An act or process of melting.

Severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor, with the potential for radiation to escape; (countable) an instance of this.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Qualifier: nuclear energy

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A mass of melted material.

Definition source: English Wiktionary via Wiktextract

Usage: countable, rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

Chiefly preceded by a descriptive word: uncontrolled disorder which often has disastrous consequences; (countable) a situation involving this; a crisis.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

Chiefly preceded by a descriptive word: uncontrolled disorder which often has disastrous consequences; (countable) a situation involving this; a crisis.

Synonym of crash (“a sudden large decline in the value of money, stocks or other assets, etc., especially one that causes additional economic difficulties”).

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively

Topics: business, finance

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: crash

Antonyms: none provided

6

noun

Meaning 6

(Sudden) loss of control over one's behaviour, emotions, etc.; (countable) an instance of this.

An emotional outburst; a fit, a tantrum.

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively, informal

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: melty, tantrum, catfit, conniption, conniption fit, dummy spit, headfit, hissy, hissy fit, meltdown, paddy, shit fit, snit fit, wobbler, wobbly

Antonyms: none provided

7

noun

Meaning 7

(Sudden) loss of control over one's behaviour, emotions, etc.; (countable) an instance of this.

A response to sensory overload or stress, in which an autistic person is overwhelmed by intense, seemingly disproportionate emotions, behaving erratically and becoming unable to mask (“act more neurotypically”).

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively, informal

Qualifier: autism

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: melty

Antonyms: none provided

8

noun

Meaning 8

(Sudden) loss of control over one's behaviour, emotions, etc.; (countable) an instance of this.

Synonym of nervous breakdown (“an attack of a psychological disorder such as anxiety or depression which is so severe that it prevents a person from continuing to function normally”); also (loosely), a situation where one is unable to function mentally due to panic, stress, etc.

Definition source: English Wiktionary via Wiktextract

Usage: countable, figuratively, informal

Topics: human-sciences, psychology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: melty, mental breakdown, nervous breakdown

Antonyms: none provided

9

noun

Meaning 9

a disaster comparable to a nuclear meltdown

Definition source: Princeton WordNet 3.0

Examples

  • there is little likelihood of a meltdown comparable to the American banking collapse in March 1933

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: calamity, catastrophe, disaster, tragedy, cataclysm

10

noun

Meaning 10

severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: nuclear meltdown

Antonyms: none provided

Broader terms: overheating

History

Etymology

From melt (verb) + down (adverb), a deverbal from melt down (verb).

Across languages

Translations

75 source translations are retained for this English entry.

  • Bulgarian: стопя́ване (stopjávane) — act or process of melting
  • Finnish: sulaminen — act or process of melting
  • Finnish: sulanut massa — mass of melted material
  • Angika: नाभिकीय गलाव (nābhikīya galāv) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Arabic: اِنْصِهَار نَوَوِيّ (inṣihār nawawiyy) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Armenian: ռեակտորի միջուկի հալում (ṙeaktori miǰuki halum) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Armenian: մելտդաուն (meltdaun) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Basque: nukleoaren fusioa — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Basque: nukleo-fusioa — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Bulgarian: разтопя́ване на акти́вната зо́на (raztopjávane na aktívnata zóna) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Bulgarian: разтопя́ване (raztopjávane) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Catalan: fusió de nucli — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Chinese Mandarin: 堆芯熔毀 /堆芯熔毁 (duīxīn rónghuǐ) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Czech: roztavení reaktoru — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Danish: nedsmeltning — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Dutch: kernsmelting — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Finnish: reaktoriytimen sulaminen — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Finnish: sulaminen — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • French: fusion du cœur d'un réacteur nucléaire — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • German: Kernschmelze — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Greek: τήξη (tíxi) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Hebrew: התכה (hatakhá) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Hindi: नाभिकीय गलाव (nābhikīya galāv) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Hungarian: zónaolvadás — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Indonesian: kebocoran nuklir — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Irish: leá iomlán — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Italian: fusione del nocciolo — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Japanese: メルトダウン (merutodaun) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Japanese: 炉心熔融 (roshin-yōyū) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Korean: 노심 용해 (nosim yonghae) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Low German: Karnsmölt — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Malay: peleburan nuklear — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Norwegian Bokmål: kjernefysisk nedsmelting — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Norwegian Nynorsk: kjernefysisk nedsmelting — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Persian: ذوبشدن سوخت هستهای — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Polish: stopienie rdzenia reaktora jądrowego — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Portuguese: derretimento nuclear — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Romanian: topire — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Russian: мелтда́ун (mɛltdáun) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Russian: расплавле́ние (rasplavlénije) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Russian: разруше́ние и́з-за расплавле́ния (razrušénije íz-za rasplavlénija) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Serbo-Croatian: taljenje jezgre — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Spanish: copelación/fundición nuclear — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Spanish: derretimiento nuclear — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Spanish: fusión de núcleo — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Swedish: härdsmälta — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Tagalog: nukleyar na pagkatunaw — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Tagalog: pagkalusaw na nukleyar — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Tamil: அணுக்கரு உருகல் (aṇukkaru urukal) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Thai: การหลอมละลายนิวเคลียร์ — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Turkish: nükleer erime — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Ukrainian: розплавлення (rozplavlennya) — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Vietnamese: nóng chảy hạt nhân — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Welsh: toddiad niwclear — severe uncontrolled overheating and melting of the fuel in the core of a nuclear reactor
  • Bulgarian: и́зблик (ízblik) — (sudden) loss of control over one’s behaviour, emotions, etc.; an instance of this
  • Bulgarian: при́стъп (prístǎp) — (sudden) loss of control over one’s behaviour, emotions, etc.; an instance of this
  • Finnish: purkaus — (sudden) loss of control over one’s behaviour, emotions, etc.; an instance of this
  • Finnish: räjähdys — (sudden) loss of control over one’s behaviour, emotions, etc.; an instance of this
  • Finnish: tunneromahdus — autistic response to sensory overload or stress
  • Danish: nedsmeltning — situation where one is unable to function mentally due to panic, stress, etc.
  • Finnish: romahdus — situation where one is unable to function mentally due to panic, stress, etc.
  • German: Nervenzusammenbruch — situation where one is unable to function mentally due to panic, stress, etc.
  • German: Zusammenbruch — situation where one is unable to function mentally due to panic, stress, etc.
  • Hebrew: מלטדאון (méltdaun) — situation where one is unable to function mentally due to panic, stress, etc.
  • Hebrew: התמוטטות (hitmotetút) — situation where one is unable to function mentally due to panic, stress, etc.
  • Hebrew: התמוטטות עצבים (hitmotetút atsabím) — situation where one is unable to function mentally due to panic, stress, etc.
  • Hebrew: קריסה (krisá) — situation where one is unable to function mentally due to panic, stress, etc.
  • Portuguese: catástrofe — situation where one is unable to function mentally due to panic, stress, etc.
  • Romanian: criză — situation where one is unable to function mentally due to panic, stress, etc.
  • Russian: встря́ска (vstrjáska) — situation where one is unable to function mentally due to panic, stress, etc.
  • Serbo-Croatian: eratično stanje — situation where one is unable to function mentally due to panic, stress, etc.
  • Spanish: chiripiolca — situation where one is unable to function mentally due to panic, stress, etc.
  • Spanish: chiripiorca — situation where one is unable to function mentally due to panic, stress, etc.
  • Spanish: chucaque — situation where one is unable to function mentally due to panic, stress, etc.
  • Spanish: corajina — situation where one is unable to function mentally due to panic, stress, etc.