doze off

动词 doze off:

1. change from a waking to a sleeping state
   同义词：fall asleep, dope off, flake out, drift off, nod off, drop off, drowse off

1. He dozed off during the long lecture.
   他在听那个冗长的演讲时打起瞌睡来了。
2. That proved to be my undoing, for I soon got back to my old bad habit of dozing off in front of the screen.
   这证明了我的失败，因为我不久就回到电视屏幕前打瞌睡的坏习惯去了。