Definition of be all mouth (and no trousers) in English:

be all mouth (and no trousers)

phrase

informal
  • Tend to talk boastfully without any intention of acting on one's words:

    ‘he thought Francis was all mouth’
    ‘the company has responded to taunts that it is all mouth and no trousers’
    • ‘He said that local politicians ‘were all mouth and no action’ on the issue and surely they could be doing more.’
    • ‘He could never be accused of being all mouth and no trousers.’
    • ‘Were they a serious threat or all mouth and no trousers?’
    • ‘Paul is being given advice about what to do on a date from his been-there-done-that pal Troy, who is all mouth and no trousers.’
    • ‘We all know that down in London they are all mouth and no trousers.’
    • ‘He has acquired a bit of a reputation for being all mouth and no trousers.’
    • ‘Sadly, like many a learnèd professional, she was all mouth and no backbone.’
    • ‘As far as I am concerned she is all mouth and no trousers.’
    • ‘As far as I am concerned, she is all mouth and no trousers.’
    • ‘‘I guess it's just another case of a man who's all mouth and no trousers…’ I giggle, before climbing the stairs to my sanctuary.’
    boasting, bragging, empty talk, idle talk, bombast, fustian
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