1. A hard outer layer that covers something
   "A crust of ice formed on the lake's surface";
   - incrustation, encrustation
    
2. The outer layer of the Earth
   "Earthquakes occur when tectonic plates in the Earth's crust shift";
   - Earth's crust
    
3. The trait of being rude and impertinent; inclined to take liberties
   "The student's crust amused some teachers but annoyed others";
   - gall, impertinence, impudence, insolence, cheekiness, freshness

1. Form a crust or form into a crust
   "The bread crusted in the oven"

Derived forms: crusting, crusts, crusted

Type of: change surface, cover, covering, discourtesy, layer, natural covering, rudeness

Part of: geosphere, lithosphere

Encyclopedia: Crust