To cover or soil with muck or dirt.
From the prefix 'be-' combined with 'muck' (from Middle Low German 'muck', meaning dung or filth). The 'be-' prefix intensifies the action of making something muddy or dirty.
Like many 'be-' verbs, 'bemuck' thrived in older English when people needed quick words for everyday situations—getting something thoroughly dirty while working was common enough to justify its own verb!
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