In English, dirt can refer to several things:

• Soil on the ground. Although the term "dirt" is an often used subsitute for soil, a scientist would define dirt as material staining clothes or found under the fingernails — possibly coming from soil, but certainly not necessarily soil.
• A dirt road is, technically, an unimproved road. Roads are seldom constructed of material from under the fingernails or similar.
• A colloquial term for negative information about a person. See also gossip
• Dirt is also an album by grunge band Alice in Chains.

See also: DIRT