slough

n. (蛇等)蜕皮,蜕壳
v. 蜕皮
vt. 蜕去

Every spring this snake sloughs off its skin, as it has grown too big for it.

每年春天这条蛇都要蜕去旧皮，因为它身体长大，旧皮不适用了。

The name of the slough was Despond.

这个深渊名叫绝望。