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"muck" is also used as a crossword clue. If that's what you saw, the answer is often dung (4 letters).
Definitions
remove muck, clear away muck, as in a mine
Word origin
From the German surname, from Mücke (“mosquito”).
Used in a sentence
“The car was covered in muck from the rally race.”
“I need to clean the muck off my shirt.”
“What's that green muck on the floor?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Wet dirt”4 letters
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