be all mouth
成語所屬單字mouth
be all mouth — 慣用語
1. Someone who talks a lot about doing something but never actually does it because
1.慣用語
釋義
只說不做
Someone who talks a lot about doing something but never actually does it because they lack courage.
例句
Diego said he would fight, but he's all mouth.
Don't listen to her threats; she's all mouth.