Definition of Avouch

Babylon English Dictionary
guarantee; declare to be true
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Avouch Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To maintain a just or true; to vouch for.
  
(v. t.)
To declare or assert positively and as matter of fact; to affirm openly.
  
(v. t.)
To appeal to; to cite or claim as authority.
  
(v. t.)
To acknowledge deliberately; to admit; to confess; to sanction.
  
(n.)
Evidence; declaration.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

avouch
\a*vouch"\ (&?;), n. evidence; declaration. [obs.] the sensible and true avouch of mine own eyes.
avouch
\a*vouch"\ (&?;), v. t. [imp. & p. p. avouched (&?;); p. pr. & vb. n. avouching.] [of. avochier, ll. advocare to recognize the existence of a thing, to advocate, fr. l. advocare to call to; ad + vocare to call. cf. avow to declare, advocate, and see vouch, v. t.]
1. to appeal to; to cite or claim as authority. [obs.] they avouch many successions of authorities. oke.
2. to maintain a just or true; to vouch for. we might be disposed to question its authenticity, it if were not avouched by the full evidence.
3. to declare or assert positively and as matter of fact; to affirm openly. if this which he avouches does appear. such antiquities could have been avouched for the irish.
4. to acknowledge deliberately; to admit; to confess; to sanction. thou hast avouched the lord this day to be thy god. xxvi. 17.

Shakespeare Words
guarantee; an assurance.
WordNet 2.0

Verb
1. admit openly and bluntly; make no bones about
(synonym) avow
(hypernym) admit, acknowledge