うっぷんをはらす
鬱憤を晴らす
to vent one's frustration; to relieve one's pent-up anger; to let off one's pent-up feelings; to let off steam
N3Expression
Expression, Godan verb (su ending)
to vent one's frustration•to relieve one's pent-up anger•to let off one's pent-up feelings•to let off steam