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harden

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verb harden pronunciation in British English /ˈhɑː(r)d(ə)n/ 
Word Forms
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present tense
I/you/we/theyharden
he/she/ithardens
present participlehardening
past tensehardened
past participlehardened
  1. 1
    [intransitive/transitive] to become hard or firm, or to make something hard or firm

    This additive hardens the cement in an hour.

    The bread will harden if you don't cover it.

    Synonyms and related words for this sense of harden
  2. 2
    [transitive] mainly literary to make someone become less affected or upset by unpleasant things so that they show less kindness or sympathy to other people
    harden someone to something:

    Years of reporting on wars hardened them to human suffering.

    1. a.
      [intransitive] if your expression or voice hardens, you begin to look or sound unfriendly

      His eyes hardened when he saw her.

      Synonyms and related words for this sense of harden
      Synonyms and related words for this sense of harden
  3. 3
    [intransitive/transitive] if you harden your attitude, or if it hardens, you refuse to change it

    Forsyth appeared to have hardened his line on (=his attitude towards) Europe.

derived word

hardening

noun [singular/uncountable]

She has hardening of the arteries.

a hardening of opinion against the treaty

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