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mud

mud /ˈmʌd/ noun
mud
/ˈmʌd/
noun
Britannica Dictionary definition of MUD
[noncount]
: soft, wet dirt

as clear as mud

informal
: very difficult to understand : not clear at all

drag someone's name through the mud

see 1drag

sling/throw mud

chiefly US
: to publicly say false or bad things about someone (such as a political opponent) in order to harm that person's reputation
see also mudslinging

your name is mud

informal
◊ If your name is mud people do not like or trust you.