Definition
To reveal a secret, often unintentionally or carelessly.
泄漏秘密或机密。
I wanted to keep this a secret, but Tom blew the gaff at the party.
我想保守这个秘密，但汤姆在派对上泄漏了。
She promised not to blow the gaff on our plan, but she still let it slip.
她承诺不会泄漏我们的计划，但还是说漏了嘴。
Don't tell anyone, or you'll blow the gaff on my secret.
不要告诉任何人，否则你会泄漏我的秘密。