use one's head

verb

(idiomatic) To think carefully, especially as an alternative to being guided by one's emotions. / (humorous) To headbutt.

You need to use your head and come up with a solution.

意味（1）

(idiomatic) To think carefully, especially as an alternative to being guided by one's emotions.

He never—so they agreed—uses his head. He never—I think I have their phrase correct—stops to think.

意味（2）

(humorous) To headbutt.