clench

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clench

a device that grasps or grips, such as a clamp

clinch, clench

To secure or fasten a nail, staple, screw, etc., by hammering the protruding point so that it is bent over.
References in periodicals archive ?
What that $10 title means is simply that when under stress, if a human being clenches one hand, the other tends to clench as well.
Her ass clenches, she has shifts in temperature, she starts grabbing people and fondling herself.
The aerobics teacher says the routine, including butt clenches and heel push-ups, will reduce stress.