Definitions from Wiktionary (crust)

▸ noun:  A more solid, dense or hard layer on a surface or boundary.
▸ noun:  The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc.
▸ noun:  An outer layer composed of pastry
▸ noun:  The bread-like base of a pizza.
▸ noun:  (British, Australia, New Zealand, Ireland, Canada, Northern US) A slice of bread cut from the end of a loaf; the heel.
▸ noun:  (geology) The outermost layer of the lithosphere of the Earth.
▸ noun:  (astronomy, by extension) The outermost layer of any terrestrial planet.
▸ noun:  The shell of crabs, lobsters, etc.
▸ noun:  (British, Australia, informal) A living.
▸ noun:  (uncountable, informal) Nerve, gall.
▸ noun:  (UK, Australia, slang, dated) The head.
▸ verb:  (transitive) To cover with a crust.
▸ verb:  (intransitive) To form a crust.
▸ noun:  (music) Ellipsis of crust punk (a subgenre of punk music) [(uncountable) A subgenre of punk rock, derived from hardcore punk with extreme metal elements, often with pessimistic lyrics about political and social ills.]

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