Definition of clench verb from the Oxford Advanced American Dictionary

     

    clench

     verb
    verb
    NAmE//klɛntʃ//
     
    Verb Forms present simple I / you / we / they clench
     
    he / she / it clenches
     
    past simple clenched
     
    -ing form clenching
     
     
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  1. 1[transitive, intransitive] clench (something) when you clench your hands, teeth, etc., or when they clench, you press or squeeze them together tightly, usually showing that you are angry, determined, or upset He clenched his fists in anger. Through clenched teeth she told him to leave. His jaw was clenched tight. His fists clenched slowly until his knuckles were white.
  2. 2[transitive] clench something (in/between something) to hold something tightly and firmly Her pen was clenched between her teeth. She had a gun clenched tightly in her hand.
See the Oxford Advanced Learner's Dictionary entry: clench