Standard Lemma guide

loco

adj · adv · noun · verb · 9 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.

  • UK: /ˈləʊ.kəʊ/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -əʊkəʊ
  • CMU ARPABET: L OW1 K OW0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Crazy.

Definition source: English Wiktionary via Wiktextract

Usage: colloquial

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Intoxicated by eating locoweed.

Definition source: English Wiktionary via Wiktextract

Usage: Southwestern, US

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: pea struck

Antonyms: none provided

3

adv

Meaning 3

A direction in written or printed music to be returning to the proper pitch after having played an octave higher or lower.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: entertainment, lifestyle, music

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A certain species of Astragalus or Oxytropis, capable of causing locoism.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: locoweed

Antonyms: none provided

5

noun

Meaning 5

Short for locomotive.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, informal

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

Short for locofoco, in its various senses.

Definition source: English Wiktionary via Wiktextract

Usage: US, abbreviation, alt-of, historical, informal

Topics: government, politics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

verb

Meaning 7

To poison with the loco plant; to affect with locoism.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

verb

Meaning 8

To render insane.

Definition source: English Wiktionary via Wiktextract

Usage: broadly, colloquial, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

adjective satellite

Meaning 9

informal or slang terms for mentally irregular

Definition source: Princeton WordNet 3.0

Examples

  • it used to drive my husband balmy

Meaning relationships

Synonyms: balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky

Antonyms: none provided

History

Etymology

From Spanish loco (“insane, crazy; loose”).

Borrowed from Italian.

From clipping of locomotive and locofoco, both from Latin locus (“place, cause”).

Across languages

Translations

11 source translations are retained for this English entry.

  • Bulgarian: луд (lud) — crazy
  • Bulgarian: куку (kuku) — crazy
  • Bulgarian: въртоглав (vǎrtoglav) — crazy
  • Chinese Mandarin: 瘋 /疯 (fēng) — crazy
  • Finnish: hullu — crazy
  • Russian: чо́кнутый (čóknutyj) — crazy
  • German: Lok — short form of locomotive
  • Norwegian Bokmål: lok — short form of locomotive
  • Norwegian Nynorsk: lok — short form of locomotive
  • Russian: лок (lok) — short form of locomotive
  • Swedish: lok — short form of locomotive