slough [slaʊ]

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vi.蜕皮，脱落，抛弃；vt.使陷入泥沼；抛弃；n. 蜕下的皮（或壳）；绝境；[地理] 泥沼

(of some animals ) to have a layer of skin come off

He was not able to slough off the memories of the past. 他无法忘记过去。
A cicada throws its slough. 蝉是要蜕皮的。