definition of
crust

[1] #1 crust n. [Earth's crust] the outer layer of the Earth. wn

[2] #2 crust v. form a crust or form into a crust; "The bread crusted in the oven". wn

[3] #3 crust n. [incrustation, encrustation] a hard outer layer that covers something. wn

[4] #4 crust n. [gall, impertinence, impudence, insolence, cheekiness, freshness] the trait of being rude and impertinent; inclined to take liberties. wn