Definition of 'sound off'
- speak one's opinion without fear or hesitation; "John spoke up at the meeting"
Synonyms: opine speak up animadvert
- start playing; "The musicians struck up a tune"
Synonyms: strike up
- express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about"
Synonyms: complain kick plain quetch kvetch
Antonyms: cheer cheer up chirk up