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Latin crusta ‎(hard outer covering) via Anglo-Norman and Old French cruste, from Proto-Indo-European *krus-to ‎(that which has been hardened), from *kreus ‎(to form a crust, begin to freeze), related to Old Norse hroðr ‎(scurf), Old English hruse ‎(earth), Old High German hrosa ‎(crust, ice), Latvian kruwesis ‎(frozen mud), Ancient Greek κρύος ‎(krúos, frost, icy cold), κρύσταλλος ‎(krústallos, crystal, ice), Avestan [script needed] ‎(xruzdra-, hard), Sanskrit क्रुड् ‎(kruḍ, thicken, make hard)


crust ‎(countable and uncountable, plural crusts)

  1. A more solid, dense or hard layer on a surface or boundary.
  2. The external layer of most types of bread.
  3. An outer layer composed of pastry
    • Dryden
      Th' impenetrable crust thy teeth defies.
    • Macaulay
      They [] made the crust for the venison pasty.
  4. The bread-like base of a pizza.
  5. (geology) The outermost layer of the lithosphere of the Earth.
  6. The shell of crabs, lobsters, etc.
  7. (uncountable) Nerve, gall.
    You've got a lot of crust standing there saying that.
    • 1960, P. G. Wodehouse, Jeeves in the Offing, chapter XVIII:
      “Oh?” she said. “So you have decided to revise my guest list for me? You have the nerve, the – the –” I saw she needed helping out. “Audacity,” I said, throwing her the line. “The audacity to dictate to me who I shall have in my house.” It should have been “whom”, but I let it go. “You have the –” “Crust.” “– the immortal rind,” she amended, and I had to admit it was stronger, “to tell me whom” – she got it right that time – “I may entertain at Brinkley Court and who” – wrong again – “I may not.”
  8. crust punk (a subgenre of punk music)


Related terms[edit]


crust ‎(third-person singular simple present crusts, present participle crusting, simple past and past participle crusted)

  1. (transitive) To cover with a crust.
    • Boyle
      The whole body is crusted over with ice.
    • Felton
      Their minds are crusted over, like diamonds in the rock.
  2. (intransitive) To form a crust.