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stiffen

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verb stiffen pronunciation in British English /ˈstɪf(ə)n/ 
Word Forms
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present tense
I/you/we/theystiffen
he/she/itstiffens
present participlestiffening
past tensestiffened
past participlestiffened
  1. 2

    stiffen

    or

    stiffen up

    [intransitive] to become stiff and difficult to move

    Her old fingers were stiffening up now.

    Synonyms and related words for this sense of stiffen
    1. a.

      stiffen

      or

      stiffen up

      [transitive] to make something stiff

      He sat up straight, stiffening his back.

      Synonyms and related words for this sense of stiffen
  2. 3
    [intransitive/transitive] if your resolve or resistance stiffens, or if you stiffen it, you become more determined
    stiffen someone's resistance:

    The army stiffened their resistance.

    stiffen someone's resolve:

    The air attack only served to stiffen the enemy's resolve.

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