avouch

UK: /əˈvaʊtʃ/ US: (ə vouch′)

WordReference Random House Unabridged Dictionary of American English © 2025

a•vouch  (ə vouch′), v.t. 

1. to make frank acknowledgment or affirmation of;
   declare or assert with positiveness.
2. to assume responsibility for;
   vouch for;
   guarantee.
3. to admit;
   confess.

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

a•vouch′er, n. 
a•vouch′ment, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

avouch / əˈvaʊtʃ/ verb (transitive)

1. to vouch for; guarantee
2. to acknowledge
3. to assert

Etymology: 16th Century: from Old French avochier to summon, call on, from Latin advocāre; see advocate

aˈvouchment noun