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3. harden heart

harden heart

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harden your heart

(slightly formal)

to make yourself stop feeling kindness and sympathy He found it difficult to harden his heart completely against his old colleague.

See also: harden, heart

harden your heart

  (slightly formal)

to make yourself stop feeling kind or friendly towards someone You've just got to harden your heart and tell him to leave.

See also: harden, heart