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English definition of “moon”

moon

noun uk   /muːn/ us  
the moon [S] A2 the round object that moves in the sky around the Earth and can be seen at night: What time does the moon rise/set (= appear/disappear in the sky)? [S or U] the shape made by the amount of the moon that you can see at a particular time: There's no moon (= you cannot see the moon) tonight. a crescent/full/new moon [C] a similar round object that moves around another planet: Jupiter has at least 16 moons.

moon

verb [I ] uk   /muːn/ informal us  

moon verb [I ] (NO PURPOSE)

[usually + adv/prep] to move or spend time in a way that shows little interest and no clear purpose: She was mooning about/around the house all weekend. He's been mooning over (= looking foolishly at) those holiday photos all afternoon.

moon verb [I ] (SHOW BOTTOM)

to show your naked bottom in public, as a joke or as a protest : Two male juveniles were arrested and charged with indecent exposure after they mooned a police officer.
(Definition of moon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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