let the cat out of the bag idiom
无意中泄秘，说漏嘴
to allow a secret to be known, usually without intending to
I was trying to keep the party a secret, but Mel went and let the cat out of the bag. 我尽力守住要举办聚会这个秘密，可是梅尔一去就说漏了嘴。
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