give the lie to

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give the lie to

  1. (idiomatic, transitive) to prove (something) to be false; to refute.
    They found plenty of email that gave the lie to his assertion that he didn't know about the incident.
    • 1934, Agatha Christie, chapter 9, in Murder on the Orient Express, London: HarperCollins, published 2017, page 262:
      'The automatic under his pillow gave the lie to that statement.'