wince

1. V-I If you wince, the muscles of your face tighten suddenly because you have felt a pain or because you have just seen, heard, or remembered something unpleasant. (由于疼痛或看见、听到或记起某些不愉快的事而) 龇牙咧嘴

Every time he put any weight on his left leg he winced in pain. 每当他的左腿受力时，他就会疼得龇牙咧嘴。

2. N the act of wincing 龇牙咧嘴

3. N a roller for transferring pieces of cloth between dyeing vats (洗布染布用的)绞车