"he released his clasp on my arm" "he has a strong grip for an old man" "she kept a firm hold on the railing"
"clench a steering wheel"
"clench one's jaw"
Her hair was clenched in curlers.
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)