To inform
communicate, explain, say, state, instruct, direct, command, order, disclose, divulge, reveal, make known, utter, speak, report, recite, announce, let know, notify, give notice, declare, acquaint, advise, confess, impart, apprise, familiarize, represent, assert, mention, relate, convey, voice, let out, acknowledge, own, let in on, give the facts, reel off, spit out, come out with, give out, release, leak out, give inside information, break it to, break the news, express, put, show, indicate, carry tales, reveal a secret, betray, tattle, leave word, assure, keep posted, expose, lay open, open up, blurt out, fill in*, let on*, let slip*, clue in*, tell all*, level with*, give away*, come across with*, shoot*, come clean*, make a clean breast of*, get something off one's chest*; see also discuss, inform 2, notify 1, reveal 1, say.
Antonyms hide*, keep secret, be silent.