clench
verb
[ klɛn(t)ʃ ]
• (with reference to the fingers or hand) close into a tight ball, especially as a manifestation of extreme anger.
• "she clenched her fists, struggling for control"
clench
noun
• a contraction or tightening of part of the body.
• "she saw the anger rise, saw the clench of his fists"
Origin:
Old English (in the sense of clinch ‘fix securely’): of Germanic origin; related to cling.
