open one's mouth (verb) speak: talk
Detalii: say, speak, and tell are near synonyms, but say is usually followed by a statement or words actually uttered
Sinonime: barbarism, blunder, faux pas, gaffe, gaucherie, goof, immodesty, impudence, inappropriateness, incongruity, incorrectness, indecency, indecorum, inelegance, rudeness, slip*, solecism, unbecomingness, unfitness, unseemliness, unsuitability, unsuitableness, vulgarism, vulgarity
Antonime: be quiet,
listen