verb / noun
clench
KLENCH/klentʃ/
A tight closing or gripping, or the act of doing so.
The athlete clenches a hand into a tight fist.

Etymology
Old English clencan meant “make cling”: to cause something to hold fast. This connects a tight grip with the later sense of setting fists or teeth firmly together.
In context
it is an issue with the muscles and uh not like somehow training yourself to clench when you should be releasing
More examples
- She notices the tight clench of his jaw.
- The child clenches the toy to his chest.
- His teeth remained clenched throughout the tense meeting.
Forms
clench · clenches · clenched · clenching