Etymology: (1675–85; < F défilé, n. use of ptp. of défiler to file off; see defilade)
Definition of 'defile'
Princeton's WordNet
1. (verb)defile, gorge a narrowpass (especially one between mountains)
2. (verb)defile, sully, corrupt, taint, cloud place under suspicion or castdoubt upon "sully someone's reputation"
3. (verb)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"
4. (verb)foul, befoul, defile, maculate spot, stain, or pollute "The townspeople defiled the river by emptying raw sewage into it"