英语中的dig in one's heels的意思大概为：拒绝做别人试图说服你做的事，尤其是拒绝改变你自己的意见或计划；表示顽固，固执己见的意思，作动词使用。

下面是dig in one's heels的用法，看对话：

Colleague 1:  I really think that Plan A has the best chance of success. Almost everyone agrees. Why doesn't the boss see it?

Colleague 2:  The boss can be very stubborn in these situations.

Colleague 1:  There must be something we can do. There must be some way to convince him.

Colleague 2:  I'm afraid that in this situation, the more we push, the more the boss will dig in his heels.