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

1.
gunakan otakmu, berpikir cerdas
to think carefully and intelligently about something, especially to solve a problem
:
•
Come on, use your head! There must be a simpler way to do this.
Ayolah, gunakan otakmu! Pasti ada cara yang lebih sederhana untuk melakukan ini.
•
If you would just use your head, you'd realize the answer is obvious.
Jika kamu mau menggunakan otakmu, kamu akan menyadari jawabannya sudah jelas.