Meaning

• Soil or earth.

• A stain or spot (on clothes etc); any foreign substance that worsens appearance.

• Previously unknown facts, or the invented "facts", about a person.

  "The reporter uncovered the dirt on the businessman by going undercover."

• Meanness; sordidness.

• In placer mining, earth, gravel, etc., before washing.

• Freckles

Meaning

• To make foul or filthy; soil; befoul; dirty