verb (used with object)

  1. to remove the frost or ice from: to defrost a refrigerator; to defrost the windshield of a car.
  2. to thaw or partially thaw (frozen food).

verb (used without object)

  1. to become free of ice or frost: The refrigerator defrosted quickly.
  2. to thaw, as frozen food: The meat took two hours to defrost.


  1. to make or become free of frost or ice
  2. to thaw, esp through removal from a refrigerator

1895, from de- + frost. Related: Defrosted; defrosting.

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