Meaning

• Made dirty with mud.

• Made unclear, obfuscated (generally as part of the phrase muddied the water)

  "He muddied the situation until they acquitted in confusion."

• Made muted of color.

  "The addition of the second batch of paint muddied the bright colors to a dull and washed look."

Meaning

• To get mud on (something).

  "If you muddy your shoes don't wear them inside."

• To make a mess of, or create confusion with regard to; to muddle.

  "The discussion only muddied their understanding of the subject."