head off是斩首的意思吗

不是！head off的意思是：拦截;拦住;防止（尤指不愉快的事）发生。

例句：1.We'll head them off at the bridge!

我们将在桥头拦截他们！

2.If you take the next turning to the right, you'll be able to head them off at the big crossroad.

如果你在下一个转弯处向右转，你就能在大的十字路口拦住他们。

3.They did this in order to head off the crisis.

他们这样做以防止发生危机。