Definition of crust noun from the Oxford Advanced Learner's Dictionary

     

    crust

     noun
    noun
    BrE BrE//krʌst//
     
    ; NAmE NAmE//krʌst//
     
     
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  1. 1[countable, uncountable] the hard outer surface of bread sandwiches with the crusts cut off
  2. 2[countable, usually singular] a layer of pastry, especially on top of a pie Bake until the crust is golden.
  3. 3[countable, uncountable] a hard layer or surface, especially above or around something soft or liquid a thin crust of ice the earth’s crust
  4. see also upper crust
    Word Origin Middle English: from Old French crouste, from Latin crusta ‘rind, shell, crust’.Extra examples Put the lid on, or a crust will form on the paints. The mud had formed a thick crust on the surface of the road. We saved a few crusts of bread for the birds.Idioms (British English, informal) to earn enough money to live on I’ve been an actor for 20 years, earning a crust wherever I can.
See the Oxford Advanced American Dictionary entry: crust