1.  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"
is one way to declare
Sample sentences: Somebody ----s that CLAUSE

2.  sound off(v = verb.creation) strike up - start playing; "The musicians struck up a tune"
is one way to play
Sample sentences: Somebody ----s

3.  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

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