ㄧㄠˇㄐㄧㄣˇㄧㄚˊㄍㄨㄢyǎojǐn‑yáguān

咬紧牙关
  1. 承受疼痛緊緊咬牙比喻承受困苦堅持不懈 咬緊牙關逆境」。

lit. to bite the teeth tightly (idiom)​; fig. to grit one's teeth and bear the pain, to bite the bullet
zusammenbeißen (V)​