Usage Note
Boue is uncountable in the sense of 'mud' generally (couvert de boue — covered in mud). The adjective boueux/boueuse means muddy. Traîner quelqu'un dans la boue (to drag someone through the mud) is a common idiom meaning to smear someone's reputation. Bain de boue is a mud bath (spa treatment).
Examples
"Les enfants jouent dans la boue."
Natural Translation
The children are playing in the mud.

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