1. (verb) confirm, corroborate, sustain, substantiate, support, affirm
establish or strengthen as with new evidence or facts
Synonyms: actualise, realise, abide, embody, verify, get, support, stomach, defend, plunk for, hold up, substantiate, keep going, actualize, back, have, avow, fend for, patronise, stick out, assert, back up, keep, digest, nurture, keep up, corroborate, endorse, validate, reassert, hold, confirm, bear out, incarnate, affirm, swan, subscribe, brook, indorse, body forth, tolerate, suffer, endure, stand, aver, maintain, prolong, nourish, sustain, realize, patronize, underpin, plump for, patronage, put up, swear, bear
Antonyms: negate, contradict
2. (verb) affirm, verify, assert, avow, aver, swan, swear
to declare or affirm solemnly and formally as true
Synonyms: vagabond, depose, put forward, ramble, support, range, trust, bank, stray, rove, roll, rely, say, cast, imprecate, avouch, insist, wander, control, corroborate, assert, confirm, affirm, swan, curse, blaspheme, tramp, avow, allege, verify, asseverate, aver, maintain, drift, sustain, substantiate, depone, roam, swear, cuss
Antonyms: contradict, negate
3. (verb) affirm
say yes to
Synonyms: swear, substantiate, avow, sustain, verify, assert, support, swan, corroborate, confirm, aver
Antonyms: negate, contradict
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Synonyms and Antonyms of affirm 
