give the game away

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

秘密をばらす, 計画を台無しにする

to reveal a secret or surprise, often unintentionally

:
Don't give the game away by telling her about the surprise party.
サプライズパーティーのことを彼女に話して、秘密をばらさないで
His nervous laughter almost gave the game away.
彼の神経質な笑いが、ほとんど秘密をばらしてしまった