One way to hold this word: a husk is the dry layer between you and the good part. Green leaves around an ear of corn. The rough coat off a grain of rice. The thick fibre around a coconut. It is always outside, always dry, and always in the way. From that one picture the other uses follow easily. Taking that layer off is the verb. And when the good part inside has gone and only the dry layer is standing, that is a husk too — a building, a tree, or a person.
From the word’s history
The packet's Wiktionary entry traces the word to Middle English huske, and offers two possible routes further back: an Old English word for a little covering or sheath, or a Middle Low German word for a little house or sheath. It marks both as uncertain. Either way the earlier meaning is a small covering, which is exactly the modern core.
來源把這個字追到中古英語的 huske，再往前給了兩條可能：一條接到古英語裡「小小的套子、殼」，另一條接到低地德語的「小房子、套子」。來源自己標明兩條都不確定。不過兩條的早期意思都是「小小的包覆物」，跟今天的核心畫面正好對得上。
Wiktionary entry for husk (etymology 1), supplied in this packet (source_ref kaikki:3f6f69a190036ae4:800399271:34360): From Middle English huske; perhaps from Old English *husuc / *hosuc (little covering, sheath); alternatively from Middle Low German hûs(e)ken (little house, sheath).
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