late 13c., from mud + -y (2). Big Muddy in reference to the Missouri or Mississippi rivers is first recorded 1825.
muddy (v.)
"to make muddy," c. 1600, from muddy (adj.). Related: Muddied; muddying.
mucous
mucus
mud
mudder
muddle
muddy
mud-flap
mudhole
mudsill
muenster
muesli
