clenches
v.
紧握，抓紧，咬紧( clench的第三人称单数 );
例句:
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My jaw clenches tight and my hands begin to tremble.
来自NEWYORKER
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Her knuckles whiten as she clenches her hands harder.
她的手握得越来越紧，指节都变白了。
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Michael clenches Westmoreland's hand, Give Anna her Poppa's love.
Westmoreland紧握Michael的手, 给Anna带去她父亲的问候.