大嘴巴在英语中通常被称为"big mouth"，它的来源可能源于人们对那些喜欢夸夸其谈的人的一种贬义词。

例句：

She has a big mouth and can't keep a secret to save her life.

(她是个大嘴巴，连保密都做不到。)

He's always getting into trouble because of his big mouth.

(他总是因为嘴巴大而陷入麻烦。)

I can't believe you told her about the surprise party! You really have a big mouth.

(我简直不敢相信你告诉了她关于惊喜派对的事！你真是个大嘴巴。)