2
general::
noun 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. 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
Oxford Collocations Dictionary