"clenched" in the verb sense
1. clench, clinch
hold in a tight grasp
"clench a steering wheel"
2. clench
squeeze together tightly
"clench one's jaw"
"clenched" in the adjective sense
1. clenched, clinched
closed or squeezed together tightly
"a clenched fist"
"his clenched (or clinched) teeth"
Source: WordNet® (An amazing lexical database of English)
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