head off

动词 head off:

1. prevent the occurrence of; prevent from happening
   同义词：debar, obviate, deflect, avert, stave off, fend off, avoid, ward off

1. The first thing to be done was to head off the enemy from the tender spots and vital places.
   首先要做的事是防止敌人从防守不严的部位及要害地方逃走。
2. I only asked you a question. There's no need to bite my head off.
   我只是问你一个问题。你何必对我这么凶。
3. He'll talk your head off if you give him a chance.
   他一有机会就会对你说个没完。
4. Don't expect me to sit here like a good boy while Smith is up there talking his head off.
   不要指望我会像个乖孩子地坐在这儿，而史密斯在那里唠叨个没完。