give the game away

US /ɡɪv ðə ɡeɪm əˈweɪ/
UK /ɡɪv ðə ɡeɪm əˈweɪ/
"give the game away" picture
1.

to reveal a secret or surprise, often unintentionally

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Don't give the game away by telling her about the surprise party.
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His nervous laughter almost gave the game away.
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give awaygamegamingawaygivegive inSEA Games