/ krʌst; NAmE / noun
1.
[ C , U ] the hard outer surface of bread :
sandwiches with the crusts cut off
2.
[ C , usually sing. ] a layer of pastry , especially on top of a pie :
Bake until the crust is golden.
3.
[ C , U ] a hard layer or surface, especially above or around sth soft or liquid :
a thin crust of ice
the earth's crust
—see also the upper crust
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IDIOMS
see earn
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WORD ORIGIN
Middle English : from Old French crouste , from Latin crusta rind, shell, crust.