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From Old French avouchier, from Latin advocāre, present active infinitive of advocō.


avouch ‎(third-person singular simple present avouches, present participle avouching, simple past and past participle avouched)

  1. To declare freely and openly; to assert.
    • Shakespeare
      if this which he avouches does appear
    • Spenser
      Such antiquities could have been avouched for the Irish.
  2. To acknowledge deliberately; to admit; to confess; to sanction.
    • Bible, Deuteronomy xxvi. 17
      Thou hast avouched the Lord this day to be thy God.
  3. To confirm or verify, to affirm the validity of.
    • Milman
      We might be disposed to question its authenticity, it if were not avouched by the full evidence.
  4. To appeal to; to cite or claim as authority.
    • Edward Coke
      They avouch many successions of authorities.


avouch ‎(uncountable)

  1. (obsolete) evidence; declaration
    • Shakespeare
      The sensible and true avouch / Of mine own eyes.