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.