expression, ichidan verb
use one's intuition; use one's instinct; use one's head
Refers to relying on one's gut feeling, sixth sense, or practical judgment to figure something out or make a decision.
彼は勘を働かせて、危険を察知した。
He used his intuition and sensed the danger.
この問題は、
You can solve this problem if you use your head a little.