Sound off is an expression used to describe the act of speaking out loud. The crossword solutions for this term include ORATE (5 letters), YAP (3 letters), BRAG (4 letters), RANT (4 letters), TALK (4 letters), VENT (4 letters), OPINE (5 letters), SPOUT (5 letters), pipeup (6 letters), REPINE (6 letters), and GRUMBLE (7 letters). All of these words are synonyms for speaking out loud, but they vary in intensity. ORATE and TALK are more formal and polite ways of expressing oneself, while YAP, BRAG, RANT, VENT, OPINE, SPOUT, pipeup, REPINE, and GRUMBLE are more informal and often used to express frustration or anger.