资料来源 : pyDict

压低声音,静下来,停止说话;不再过分自信;吹哨子收工

资料来源 : WordNet®

pipe down
     v : become quiet or quieter; "The audience fell silent when the
         speaker entered" [syn: {quieten}, {hush}, {quiet}, {quiesce},
          {quiet down}] [ant: {louden}]