"unclench" in Chinese (Simplified)
松开放松（拳头、牙齿）
Definition
把紧握的东西松开，尤其指拳头、牙齿或下巴。通常在因紧张或压力松开时使用。
Usage Notes (Chinese (Simplified))
多用于描述因紧张或生气而紧握后放松，不用于普通打开或松开的动作，多见于描写情绪紧绷的场景。
Examples
Please unclench your fists.
请**松开**你的拳头。
He slowly unclenched his teeth.
他慢慢地**松开**了牙齿。
Try to unclench your jaw and relax.
试着**放松**下巴，放轻松。
She didn’t realize she was gripping the steering wheel so tightly until she finally unclenched her hands.
她直到**松开**手才发现自己一直紧握着方向盘。
When I’m nervous, I forget to unclench my jaw and it starts to hurt.
我紧张时，会忘了**放松**下巴，结果开始疼。
You need to unclench and let things go sometimes.
有时候你得**放松**，让事顺其自然。