1 : clinch sense 2. 2 : to hold fast : clutch clenched the arms of the chair. 3 : to set or close tightly clench one's teeth clench one's fists.

What is Clinch of fist?

By extension of meaning, both clench and clinch came to refer to the act of closing the hands tightly, as in "clenching your fists in anger, frustration, etc." By the 19th century, however, clench took hold, and to this day is the more acceptable choice.

What does clench up mean?

1. to clench part or all of the body. You might clench up when you are stressed.