clench

[klentʃ]

释义

v.紧握，紧闭
to close (the hands, etc.) tightly

例句
Doctor:Miss Kuchenski, why aren't you wearing a gown, and why are you clenching your knees? (2 Broke Girls)
医生：科臣斯基，为什么你不穿上长袍，而且为什么你紧夹膝盖。（破产姐妹）