"mud" in the noun sense
1. mud, clay
water soaked soil soft wet earth
slanderous remarks or charges
"mud" in the verb sense
1. mire, muck, mud, muck up
soil with mud, muck, or mire
"The child mucked up his shirt while playing ball in the garden"
plaster with mud
Source: WordNet® (An amazing lexical database of English)
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