be all mouth
UK also be all mouth and no trousers informalto talk a lot about doing something but never do it:
He says he's going to complain to the manager, but he's all mouth.
Thesaurus: synonyms and related words
Talkative and eloquent
- articulate
- chatterbox
- communicative
- cry
- eloquent
- expansive
- expressive
- fluent
- garrulous
- gift
- gossip
- mouth
- oratory
- silver-tongued
- smooth
- talkative
- the gift of the gab idiom
- turn of phrase
- voluble
- well turned
See more results »