expression, godan verb (-ku)
relax; let the tension out of one's shoulders; not take oneself too seriously
Idiomatic expression meaning to release physical or mental tension, often used when someone is being too stiff or serious.
面接の前は、肩の力を抜いて深呼吸しよう。
Before the interview, relax and take a deep breath.
彼
He's always relaxed and easy to talk to.