What does the word vouch mean?

Usage examples for vouch

  1. At any rate, there'll be no harm done by it, I can vouch for that. – The Dragon's Secret by Augusta Huiell Seaman
  2. I have heard that Mary pleaded with her father, but I will not vouch for the truth of that. – The Birthright by Joseph Hocking
  3. I will not vouch for the truth of the above, although I heard it, and I think it was not unlikely to have taken place. – Twenty-Five Years in the Rifle Brigade by William Surtees
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