be all mouth

(redirected from be all mouth and trousers)

be all mouth

  (British, American & Australian informal) also be all mouth and (no) trousers (British informal)
if someone is all mouth, they talk a lot about doing something but they never do it She says she'll complain to the manager but I think she's all mouth. You're all mouth and no trousers. Why don't you just go over there and ask her out?
See also: all, mouth