#1 crust n. [Earth's crust] the outer layer of the Earth. wn
#2 crust v. form a crust or form into a crust; "The bread crusted in the oven". wn
#3 crust n. [incrustation, encrustation] a hard outer layer that covers something. wn
#4 crust n. [gall, impertinence, impudence, insolence, cheekiness, freshness] the trait of being rude and impertinent; inclined to take liberties. wn
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