"crust" in the noun sense
1. crust, Earth's crust
the outer layer of the Earth
2. crust, incrustation, encrustation
a hard outer layer that covers something
3. crust, gall, impertinence, impudence, insolence, cheekiness, freshness
the trait of being rude and impertinent inclined to take liberties
"crust" in the verb sense
form a crust or form into a crust
"The bread crusted in the oven"
Source: WordNet® (An amazing lexical database of English)
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