Verb has 3 senses

• sound off(v = verb.communication) animadvert, opine, speak out, speak up - express one's opinion openly and without fear or hesitation; "John spoke up at the meeting"


Sample sentence:
Somebody ----s that CLAUSE

• sound off(v = verb.creation) strike up - start playing; "The musicians struck up a tune"


Sample sentence:
Somebody ----s

• sound off(v = verb.communication) complain, kick, kvetch, plain, quetch - express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about"

Sample sentences:
Somebody ----s
Somebody ----s that CLAUSE