Source : WordNet®

sound off
     v 1: speak one's opinion without fear or hesitation; "John spoke
          up at the meeting" [syn: {opine}, {speak up}, {animadvert}]
     2: start playing; "The musicians struck up a tune" [syn: {strike
        up}]
     3: express complaints, discontent, displeasure, or unhappiness;
        "My mother complains all day"; "She has a lot to kick
        about" [syn: {complain}, {kick}, {plain}, {quetch}, {kvetch}]
        [ant: {cheer}]