Etymology
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muddy (adj.)

late 13c., in place names, "abounding in or covered with mud," from mud + -y (2). Meaning "not clear or pure in color" is from 1580s; extended to sounds by 1960s. Big Muddy as a nickname for the Missouri or Mississippi river is attested by 1825. Related: Muddily; muddiness.

muddy (v.)

"to make muddy, bury or cover with mud," c. 1600, from muddy (adj.). Related: Muddied; muddying. The earlier verb was simply mud (1590s); muddify is attested from 1789.

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Definitions of muddy
1
muddy (adj.)
(of soil) soft and watery;
muddy barnyard
Synonyms: boggy / marshy / miry / mucky / quaggy / sloppy / sloughy / soggy / squashy / swampy / waterlogged
muddy (adj.)
dirty and messy; covered with mud or muck;
muddy boots
Synonyms: mucky
muddy (adj.)
(of color) discolored by impurities; not bright and clear; "dirty" is often used in combination;
muddy colors
Synonyms: dirty / dingy / muddied
muddy (adj.)
(of liquids) clouded as with sediment;
muddy coffee
Synonyms: cloudy / mirky / murky / turbid
2
muddy (v.)
dirty with mud;
Synonyms: muddy up
muddy (v.)
cause to become muddy;
muddy (v.)
make turbid;
muddy the water
From wordnet.princeton.edu