Definition
To reveal a secret or plan unintentionally, thereby spoiling a surprise or making something known that should have been kept hidden.
泄露秘密
He was planning a surprise for her, but he accidentally gave the game away by letting the plan slip.
他原本计划给她一个惊喜，但不小心让计划泄露，把惊喜搞砸了。
Please don't tell anyone; you absolutely must not give the game away.
请不要告诉任何人；你绝对不能泄露秘密。
She tried to keep it a secret, but her expression gave the game away about her true feelings.
她试图保守秘密，但她的表情泄露了她真实的感受。