crust

noun

1. (countable, uncountable)A more solid, dense or hard layer on a surface or boundary.
2. (countable, uncountable)The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc.
3. (countable, uncountable)An outer layer composed of pastry

   “Th' impenetrable crust thy teeth defies.”

   “They […] made the crust for the venison pasty.”

4. (countable, uncountable)The bread-like base of a pizza.
5. (Australia, British, Canada, Ireland, New-Zealand, Northern-US, countable, uncountable)A slice of bread cut from the end of a loaf; the heel.
6. (countable, uncountable)The outermost layer of the lithosphere of the Earth.

   “Holonyms: lithosphere < Earth”

   “The crust (a mere 1% of the Earth's volume) is made of lighter melt products from the mantle.”

7. (broadly, countable, uncountable)The outermost layer of the lithosphere of any terrestrial planet.

   “Holonyms: lithosphere < planet”

8. (countable, uncountable)The shell of crabs, lobsters, etc.
9. (Australia, British, countable, informal, uncountable)A living.

   “to earn one's crust”

   “Like most of us, I am frequently asked by friends and people I meet in business situations or round the dinner table what I do to earn my crust.”

10. (informal, uncountable)Nerve, gall.

    “You've got a lot of crust standing there saying that.”

11. (Australia, UK, countable, dated, slang, uncountable)The head.

    ““Well, all I can say is that if yer don't take yer dial outer the road I'll bloomin' well take an' bounce a gibber off yer crust.””

12. (abbreviation, alt-of, countable, ellipsis, uncountable)Ellipsis of crust punk, a subgenre of punk music.

verb

1. (transitive)To cover with a crust.

   “The whole body is crusted over with ice.”

   “Their minds are crusted over, like diamonds in the rock.”

2. (intransitive)To form a crust.

   “, The Goblin Reign Boxed Set Thistle held her hand over the wound and pressed a wad of tree moss against it. "Don't move," she said. "Let it crust."”