1 acknowledge, admit, allow, blurt out, come clean (informal) come out of the closet, concede, confide, disclose, divulge, 'fess up (U.S.) get (something) off one's chest (informal) grant, make a clean breast of, own, own up, recognize, sing (slang, chiefly U.S.) spill one's guts (slang)
2 affirm, assert, attest, aver, confirm, declare, evince, manifest, profess, prove, reveal
Antonyms
button one's lips, conceal, cover, deny, hide, hush up, keep mum, keep secret, keep under wraps, repudiate, suppress, withhold