ph.

1. (未经邀请)慷慨陈词
    If someone sounds off, they express their opinions strongly and rather rudely without being asked.

1. express complaints, discontent, displeasure, or unhappiness

    e.g. My mother complains all day
           She has a lot to kick about

    Synonym: complainkickplainquetchkvetch

2. express one's opinion openly and without fear or hesitation

    e.g. John spoke up at the meeting

    Synonym: opinespeak upspeak outanimadvert

3. start playing

    e.g. The musicians struck up a tune

    Synonym: strike up