pipe up

动词 pipe up:

1. begin to play or sing
2. utter a shrill cry
   同义词：shriek, shrill, pipe

1. Mary is so shy, and everyone was surprised when she piped up with a complaint at the club meeting.
   玛丽一向很怕羞，当她在俱乐部会议上大发牢骚时，大家都很吃惊。