dirt S3 [uncountable]
any substance that makes things dirty, such as mud or dust:
You should have seen the dirt on that car!
His face and hands were black with dirt.
a patch of grass, covered in dog dirt (=waste from a dog's bowels)
2TAS especially American English
earth or soil:
Michael threw his handful of dirt onto the coffin.
in (the) dirt
The children had been sitting in the dirt.
information about someone's private life or activities which could give people a bad opinion of them if it became known:
The newspapers had been digging up dirt on the President.
talk, writing, a film etc that is considered bad or immoral because it is about sex