give the game away

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

계획을 망치다, 비밀을 누설하다

to reveal a secret or surprise, often unintentionally

:
Don't give the game away by telling her about the surprise party.
깜짝 파티에 대해 그녀에게 말해서 계획을 망치지 마.
His nervous laughter almost gave the game away.
그의 초조한 웃음이 거의 계획을 망칠 뻔했다.