Language: en
Meaning: (idiomatic,intransitive,transitive)To make (something) or to become lessseriousand morecheerfulorcasual; torelax.Coordinate term:chill outI wish he'dlighten upa bit and realize that we were only joking.The mood at work has been tense, so he's looking for ways tolightenitup.1983August 6, Michael Bronski, “Gay Sensibility, Straight Imitation”, inGay Community News, page 8:Sondheim's sense of life — which is pretty pessimistic (I don't think that anyone ever ends happily ever after in a Sondheim musical) — is brought through without trying tolighten it up.2008,Adele,First Love:youlighten upmy heart when I start to cry; ; (transitive)Tolighten(something): to decrease itsweight.Near-synonym:slim downHe can't get any more power out of it [his drag racer], so now he's looking for ways tolightenitup.
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