n. Any foul or filthy substance, as excrement, mud, mire, or pitch; whatever, adhering to anything, renders it foul, unclean, or offensive.n. Earth, especially loose earth; disintegrated soil, as in gardens; hence, any detrital or disintegrated material.n. Specifically In placer-mining, the detrital material (usually sand and gravel) from which the gold is separated by washing.n. Meanness; sordidness; baseness.n. Abusive or scurrilous language.Consisting or made of loose earth: as, a dirt road (a road not paved or macadamized).To make foul or filthy; soil; befoul; dirty.