Definition of dirt

• n. - Any foul of filthy substance, as excrement, mud, dust, etc.; whatever, adhering to anything, renders it foul or unclean; earth; as, a wagonload of dirt.
• n. - Meanness; sordidness.
• n. - In placer mining, earth, gravel, etc., before washing.
• v. t. - To make foul of filthy; to dirty.