avouch

1 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, certify, testify (to), vouch (for), witnessRelated Words guarantee, warrant; affirm, assert, aver, avow, profess, vow

2 to state as a fact usually forcefully avouched that he had never cheated on his taxes in his life Synonyms affirm, allege, assert, aver, claim, avow, contend, declare, insist, maintain, profess, protest, purport, warrantRelated Words announce, broadcast, proclaim; argue, rationalize, reason; confirm, justify, vindicate; defend, persevere, support, uphold; reaffirm, reassertNear Antonyms abandon; disavow, disclaim, disown, negate, negative, reject, repudiate; challenge, dispute, question; confute, disprove, rebut, refute; contradict, counterAntonyms deny, gainsay

3 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 Synonyms affirm, aver, assert, avow, declare, guarantee, lay down, professRelated Words advance, advertise, boost, plug, promote, publicize; announce, blaze, call, proclaim, pronounce, say; accent, accentuate, emphasize, stress, underline, underscore; advocate, champion, defend, espouse, support, uphold; assure, convince, persuade; explain, justify, rationalize; reaffirm, reassertNear Antonyms minimize, understate; disregard, ignore, neglect, overlook