crust

Noun

• the trait of being rude and impertinent; inclined to take liberties

• a hard outer layer that covers something

• the outer layer of the Earth

Verb

• form a crust or form into a crust
  • The bread crusted in the oven
    

Related words

• Synonyms: 
  gall , impertinence , impudence , insolence , cheekiness , freshness , incrustation , encrustation , Earth's crust