To cover or stain with mud.
Combining 'be-' with 'mud' (from Middle Low German 'mudde'), this verb creates the meaning of making something muddy or mud-covered, following the productive Middle English pattern of 'be-' verb formation.
Many of these 'be-' verbs feel redundant today (why say 'bemud' when 'muddy' exists?), but they show how English once had multiple ways to express the same idea—over time, we standardized and lost the variants.
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