Phrase guide

blue light

noun · verb · 5 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

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No pronunciation record was provided for this word.

1

noun

Meaning 1

A mixture of chemicals (including nitre, sulfur and antimony) used in the eighteenth and nineteenth centuries for night-time signaling and general illumination.

Definition source: English Wiktionary via Wiktextract

Usage: countable, historical, uncountable

Topics: nautical, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A New England federalist, who opposed the Anglo-American War of 1812; (loosely), a federalist.

Definition source: English Wiktionary via Wiktextract

Usage: US, colloquial, countable, historical, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A flashing light, usually fitted to an emergency vehicle.

Definition source: English Wiktionary via Wiktextract

Usage: countable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

Used other than figuratively or idiomatically: see blue, light.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

verb

Meaning 5

To travel quickly in a police or ambulance vehicle with the lightbar (and possibly the siren) activated.

Definition source: English Wiktionary via Wiktextract

Usage: informal, intransitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

No etymology was provided for this word.

Across languages

Translations

7 source translations are retained for this English entry.

  • Arabic: ضَوْء أَزْرَق (ḍawʔ ʔazraq) — flashing light on emergency vehicle
  • Finnish: hälytysvalo — flashing light on emergency vehicle
  • German: Blaulicht — flashing light on emergency vehicle
  • Hungarian: kék fény — flashing light on emergency vehicle
  • Norwegian Bokmål: blålys — flashing light on emergency vehicle
  • Norwegian Nynorsk: blålys — flashing light on emergency vehicle
  • Norwegian Nynorsk: blåljos — flashing light on emergency vehicle