To cover or treat with bark, or to strip bark from trees.
From 'bark' (tree covering) plus '-en' suffix (forming verbs meaning 'to make' or 'to cause to be'), creating an action verb from the noun.
The '-en' suffix is an old English word-building tool that's quietly everywhere—'darken,' 'lighten,' and 'barken' all use the same ancient recipe for turning nouns into verbs.
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