crust

ot noun

1. Nerve, gall. You've got a lot of crust standing there saying that.
2. A living. to earn one's crust
3. A more solid, dense or hard layer on a surface or boundary.
4. The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc.

fe’l verb

1. To cover with a crust.
2. To form a crust.