Main entry: sound off, kvetch, kick, quetch, plain, complain
Definition: express complaints, discontent, displeasure, or unhappiness
Usage: My mother complains all day; She has a lot to kick about
Main entry: animadvert, sound off, speak out, speak up, opine
Definition: express one's opinion openly and without fear or hesitation
Usage: John spoke up at the meeting
Main entry: sound off, strike up
Definition: start playing
Usage: The musicians struck up a tune