Definition of AVOUCH

to declare (something) to be true or genuine <a note from my doctor avouching that my medical condition did indeed disqualify me from gym class>
Synonyms attest, authenticate, avouch, testify (to), vouch (for), witness
to state as a fact usually forcefully <avouched that he had never cheated on his taxes in his life>
Antonyms deny, gainsay
to state clearly and strongly <she tends to avouch her opinions in such a way as to imply that anyone who thinks otherwise is an idiot>

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