defile, gorge -- (a narrow pass (especially one between mountains))
Overview of verb defile
The verb defile has 3 senses
defile, sully, corrupt, taint, cloud -- (place under suspicion or cast doubt upon; "sully someone's reputation")
tarnish, stain, maculate, sully, defile -- (make dirty or spotty, as by exposure to air; 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")
foul, befoul, defile, maculate -- (spot, stain, or pollute; "The townspeople defiled the river by emptying raw sewage into it")