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 spasm spasm /ˈspæzəm/

noun

  1. () A painful and involuntary muscular contraction  ( muscle spasm , cramp , spasm )
    a painful and involuntary muscular contraction
     I had a cramp in my leg while I was running, and it was very painful
    I had a cramp in my leg while I was running, and it was very painful
  2. (pathology) sudden constriction of a hollow organ (as a blood vessel)  ( spasm )
    (pathology) sudden constriction of a hollow organ (as a blood vessel)