He'd have got away with it if his brother hadn't blown the gaff to the police.

要是他兄弟不向警察告密的话，他是能逃脱处罚的。

youdao

He used somebody else's invitation card to get into the party, and nobody would have known if Cathy had not blown the gaff.

他利用别人的请帖混入了那个聚会，如果不是凯西说出真情，谁也不知道这回事。

youdao