Meaning of “give the game away” in the English Dictionary

british dictionary

"give the game away" in British English

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give the game away

informal

to spoil a surprise or a joke by telling someone something that should have been kept secret:

It's a secret, so don't give the game away, will you?

(Definition of “give the game away” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)