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crust noun

1 on a loaf of bread/pie

ADJ. thick, thin | pastry, pie

PHRASES a crust of bread We saved a few crusts of bread for the birds.

2 hard layer on the outside of sth

ADJ. thick, thin

VERB + CRUST form The mud had formed a thick crust on the surface of the road.

CRUST + VERB form Put the lid on properly, or a crust will form on the paints.

PREP. ~ of a thin crust of ice

PHRASES the earth's crust