be all mouth and no trousers
US /bi ɔl maʊθ ænd noʊ ˈtraʊzərz/
UK /bi ɔl maʊθ ænd noʊ ˈtraʊzərz/
1.
光說不練, 雷聲大雨點小
to talk a lot about what you are going to do but fail to actually do it
:
•
He's always boasting about his plans, but he's all mouth and no trousers.
他總是吹噓自己的計畫，但他光說不練。
•
Don't listen to her promises; she's all mouth and no trousers.
別聽她的承諾；她光說不練。