clench
/klentʃ; klɛntʃ/ v
1 [Tn] close (sth) tightly or press (two things) firmly together 紧闭（某物）; 将（两物）紧压在一起
clench one's fist/jaws/teeth 攥紧拳头[咬紧牙关/咬牙]
a clenched-fist salute 握拳礼.
2 [Tn, Tn.pr]
~ sb/sth (in/with sth) grasp or hold sb/sth firmly 抓紧或握紧某人[某物]
clench the railings (with both hands) （双手）紧握栏杆
money clenched tightly in one's fist 在拳头里攥著的钱.