defile

definition: a narrow pass (especially one between mountains)
example:
speech part: noun
synonyms: gorge
definition: spot, stain, or pollute
example: The townspeople defiled the river by emptying raw sewage into it
speech part: verb
synonyms: foul
definition: make dirty or spotty, as by exposure to air
example:
speech part: verb
synonyms: stain
definition: place under suspicion or cast doubt upon
example:
speech part: verb
synonyms: corrupt

How defile is being used?