- 1[countable, uncountable] the hard outer surface of bread sandwiches with the crusts cut off
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- 2[countable, usually singular] a layer of pastry, especially on top of a pie Bake until the crust is golden.
- 3[countable, uncountable] a hard layer or surface, especially above or around something soft or liquid a thin crust of ice Earth's crust see also upper crust
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