be all mouth (and no trousers)

mať veľa rečí a žiadne skutky

1. He knew his son was all mouth and trousers. BNC

2. She says she`ll complain to the manager but I think she`s all mouth. CIDoI

3. You`re all mouth and no trousers. Why don`t you just go over there and ask her out? CIDoI

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