dirt /ˈdɝt/
  泥土,污物,汙垢
  Dirt n.
  1. 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.
     Whose waters cast up mire and dirt.   --Is. lvii. 20.
  2. Meanness; sordidness.
     Honors . . . thrown away upon dirt and infamy.   --Melmoth.
  3. In placer mining, earth, gravel, etc., before washing.
  Dirt bed Geom., a layer of clayey earth forming a stratum in a geological formation. Dirt beds are common among the coal measures.
  Dirt eating. (a) The use of certain kinds of clay for food, existing among some tribes of Indians; geophagism. --Humboldt. (b) Med. Same as Chthonophagia.
  Dirt pie, clay or mud molded by children in imitation of pastry. --Otway (1684).
  To eat dirt, to submit in a meanly humble manner to insults; to eat humble pie.
  Dirt, v. t. To make foul of filthy; to dirty.
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  dirt
       adj : (of roads) not leveled or drained; unsuitable for all year
             travel [syn: ungraded]
       n 1: the part of the earth's surface consisting of humus and
            disintegrated rock [syn: soil]
       2: the state of being covered with unclean things [syn: filth,
           grime, soil, stain, grease, grunge]
       3: obscene terms for feces [syn: crap, shit, shite, poop,
           turd]
       4: disgraceful gossip about the private lives of other people
          [syn: scandal, malicious gossip]