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light up - definition and synonyms


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phrasal verb
Word Forms
present tense
I/you/we/theylight up
he/she/itlights up
present participlelighting up
past tenselit up
past participlelit up

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  1. 1
    [intransitive/transitive] informal to light a cigarette
  2. 2
    [transitive] same as light3 (sense 2)
    They could see the airport lit up far below them.
    Fireworks were lighting up the night sky.
  3. 3
    [intransitive] to become bright or light
    There was a flash of lightning and the sky lit up.
  4. 4
    [intransitive] if a light lights up, it starts to shine
    A warning signal lit up on the dashboard.
  5. 5
    [intransitive/transitive] if someones face or eyes light up, they express a strong emotion, usually happiness or excitement
    Antony’s eyes lit up when Keiko walked into the room.
See also main entry: light


an area in the countryside where there are both housing developments and farms, and many people travel to work in nearby cities

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troll factory

a company that pays its employees to write online comments in favour or against somebody or something posing as ordinary Internet users

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