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cool head

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noun British English pronunciation: cool head 
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singularcool head
pluralcool heads
  1. [singular] the ability to stay calm and behave in a reasonable way in difficult situations

    It's important in this job to keep a cool head.

    1. a.
      [countable] someone who has this ability

      Fortunately, cool heads prevailed, and the attack was called off.

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