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iron

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adjective American English pronunciation: iron /ˈaɪrn/
  1. 2
    very strong, strict, or severe

    The whole region was still in the iron grip of winter.

    iron fist/hand (=complete control):

    For almost 50 years, Hoover ran the FBI with an iron fist.

    1. a.
      very determined

      She possesses an iron will and a sense of purpose.

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