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English definition of “your luck's in!”

your luck's in!

UK humorous
used to tell someone that they have been lucky or successful : He's been looking at you all evening - I think your luck's in, Cath.Good luck and bad luck Grammar:Luck and luckyWe use the noun luck and the adjective lucky to talk about good things happening by chance, and not because of our own efforts:
(Definition of your luck's in! from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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