1818, from muddle (v.).
1590s, "destroy the clarity of" (a transferred sense); literal sense ("to bathe in mud") is from c. 1600; perhaps frequentative formation from mud, or from Dutch moddelen "to make (water) muddy," from the same Proto-Germanic source. Sense of "to make muddy" is from 1670s; that of "make confused" first recorded 1680s. Meaning "to bungle" is from 1885. Related: Muddled; muddling.
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