defile (

     n : a narrow pass (especially one between mountains) [syn: gorge]
     v 1: place under suspicion or cast doubt upon; "sully someone's
          reputation" [syn: sully, corrupt, taint, cloud]
     2: make dirty or spotty, as by exposure to air, of metals; also
        used metaphorically: "The silver was tarnished by the long
        exposure to the air"; "Her reputation was sullied after
        the affair with a married man" [syn: tarnish, maculate,
     3: spot, stain, or pollute; "The townspeople defiled the river
        by emptying raw sewage into it" [syn: foul, befoul, maculate]