Synonyms to undergird

affirm, OK, accept, accredit, acknowledge, allege, amen, announce, annunciate, approve, argue, assert, assever, asseverate, attest, authenticate, authorize, autograph, aver, avouch, avow, back, back up, bear out, bear witness, bolster, buttress, certify, circumstantiate, confess, confirm, contend, corroborate, cosign, countersign, declare, declare roundly, depone, depose, disclose, document, endorse, enunciate, express, express the belief, fortify, give evidence, give notice, give permission, give the go-ahead, give the imprimatur, give thumbs up, guarantee, have, hold, initial, insist, issue a manifesto, issue a statement, lay down, maintain, make a statement, make an announcement, manifesto, notarize, nuncupate, pass, pass on, pass upon, permit, predicate, probate, proclaim, profess, pronounce, protest, prove, publish a manifesto, put, put it, quote, ratify, recite, reinforce, relate, report, rubber stamp, sanction, say, say amen to, seal, second, set down, sign, sign and seal, speak, speak out, speak up, stand for, stand on, state, strengthen, submit, subscribe to, substantiate, support, sustain, swear, swear an