British, American & Australian, informal, 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?

• no shit
• no-show
• no sooner do something than
• no sooner do something than do something else
• No sooner said than done.
• no sooner than
• no sooner than do something else
• no sooner than something
• no stranger to
• no stranger to something
• no strings
• no strings attached
• No such luck!
• no such luck
• No sweat!
• no sweat
• nosy parker
• not a bit
• not about to
• not a chance
• not a dry eye
• not a dry eye in the house
• not a ghost of a chance
• not a hair out of place
• not all it is cracked up to be