Definition
to compel someone or something to alter their trajectory
逼迫…改变方向
We need to find a way to head them off before they reach their destination.
我们需要找到方法在他们到达目的地之前阻止他们。
The police set up a roadblock at the intersection to head the suspect off.
警方在十字路口设置路障以拦截嫌犯。
He tried to change the subject to head her off from discussing the issue.
他试图改变话题，阻止她讨论这个问题。