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spasm

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noun British English pronunciation: spasm /ˈspæz(ə)m/ 
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singularspasm
pluralspasms
  1. 1
    [countable/uncountable] a sudden movement in which one of your muscles becomes tight and painful

    Athletes know that cold weather can induce muscle spasms.

    His muscles went into spasm and he couldn't straighten up.

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