Definition of frost verb from the Oxford Advanced American Dictionary

     

    frost

     verb
    verb
    NAmE//frɔst//
     
    Verb Forms present simple I / you / we / they frost
     
    he / she / it frosts
     
    past simple frosted
     
    -ing form frosting
     
     
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  1. 1[transitive, intransitive] to cover something, or to become covered, with a thin white layer of ice frost something (over/up) The mirror was frosted up. frost (over/up) The windows had frosted over.
  2. 2 [transitive] frost something to cover a cake, etc with frosting
See the Oxford Advanced Learner's Dictionary entry: frost