n.

1. 麵包皮；乾麵包片；派餅皮[C][U]
2. 硬外皮，外殼；冰面；雪殼[C][U]
3. 地殼[the S]
   The earth's crust is between 5 and 25 miles thick.

   地殼有五至二十五英里厚。

4. 【動】甲殼[C][U]
5. 【醫】痂[C][U]
6. 【俚】厚顏，無禮[the S]
   He had the crust to ask to borrow my new car!

   他竟有臉借我的新車！

vt.

1. 用硬皮覆蓋；在……上結硬皮
   Ice crusted the stream.

   小溪上結了一層冰。

vi.

1. 結成外殼；覆有硬皮
   The snow crusted over.

   雪結成一層冰。

n.

1. the tough outer part of a loaf of bread.
   ▸a hard, dry scrap of bread.
2. a hardened layer or coating on something soft.
   ▸a layer of pastry covering a pie.
3. the outermost layer of rock of which a planet consists, especially the part of the earth above the mantle.
4. a deposit of tartrates and other substances formed in wine aged in the bottle, especially port.
5. Brit. informal a living or livelihood:
   earning a crust.

v.