Etymology

light up

Today it means: To illuminate, to bring light to something, to brighten. Full definition →

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light up · verb1

Phrasal verb from light (“to make bright, ignite”, verb) + up (“to a higher degree”, adverb).

light up · verb2

Phrasal verb from light (“to make less heavy”, verb) + up (“to a higher degree”, adverb).

Etymology from Wiktionary, CC BY-SA 4.0.