drop away

动词 drop away:

1. get worse
   同义词：slip, drop off, fall away

1. The lecture was so dull that soon the audience begin to drop away.
   演讲单调乏味，不久，听众就开始陆续离席了。
2. I think such customs will soon drop away.
   我想这些风俗不久就会逐渐消失。