verb (used with object)
to make frank acknowledgment or affirmation of; declare or assert with positiveness.
to assume responsibility for; vouch for; guarantee.
to admit; confess.

1350–1400; Middle English avouchen < Middle French avouchier < Latin advocāre. See a-5, vouch, advocate

avoucher, noun
avouchment, noun
unavouched, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
avouch (əˈvaʊtʃ)
1.  to vouch for; guarantee
2.  to acknowledge
3.  to assert
[C16: from Old French avochier to summon, call on, from Latin advocāre; see advocate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 15c., from M.Fr. avochier "call upon as authority," from O.Fr. avochier "call (to court), advocate, plead (a case)," from L. advocare "call to" as a witness (see advocate).
"Avouch, which is no longer in common use, means guarantee, solemnly aver, prove by assertion, maintain the truth or existence of, vouch for .... Avow means own publicly to, make no secret of, not shrink from admitting, acknowledge one's responsibility for .... Vouch is now common only in the phrase vouch for, which has taken the place of avouch in ordinary use, & means pledge one's word for ...." [Fowler]
Online Etymology Dictionary, © 2010 Douglas Harper
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