use your head
US /juːz jʊər hɛd/
UK /juːz jʊər hɛd/

1.
머리를 쓰다, 생각하다
to think carefully and intelligently about something, especially to solve a problem
:
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Come on, use your head! There must be a simpler way to do this.
이봐, 머리를 써봐! 이걸 하는 더 간단한 방법이 있을 거야.
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If you would just use your head, you'd realize the answer is obvious.
네가 머리를 좀 썼다면, 답이 명백하다는 걸 알았을 거야.