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English definition of “clench”

clench

verb [T] uk   /klentʃ/ us  
to close or hold something very tightly, often in a determined or angry way: The old man clenched his fist and waved it angrily at us. With a knife clenched in/between his teeth, he climbed up the tree to cut some coconuts. "Get out of here," she said through clenched teeth.
(Definition of clench from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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