to make foul, dirty, or unclean; pollute; taint; debase.
2.
to violate the chastity of.
3.
to make impure for ceremonial use; desecrate.
4.
to sully, as a person's reputation.
Origin: 1275–1325; ME defilen, defelen, alter. of defoilen (by assoc. with filen to file3) < AF, OF defouler to trample on, violate; cf. OE befȳlan to befoul
To make filthy or dirty; pollute: defile a river with sewage.
To debase the pureness or excellence of; corrupt: a country landscape that was defiled by urban sprawl.
To profane or sully (a reputation, for example).
To make unclean or unfit for ceremonial use; desecrate: defile a temple.
To violate the chastity of.
[Middle English defilen, alteration (influenced by filen, to befoul, from Old English fȳlan; see p- in Indo-European roots) of defoulen, to trample on, abuse, pollute, from Old French defouler, to trample, full cloth : de-, de- + fouler, to trample, beat down; see full2.] de·file'ment n., de·fil'er n., de·fil'ing·ly adv.
de·file 2 (dĭ-fīl') intr.v.
de·filed, de·fil·ing, de·files To march in single file or in files or columns. n.
A narrow gorge or pass that restricts lateral movement, as of troops.
A march in a line.
[French défiler : dé-, away, off (from Old French de-; see de-) + file, line, file (from Old French filer, to spin thread, march in line; see file1). N., from French défilé, from past participle of défiler.]
"make filthy," c.1280, from O.Fr. defouler "trample down, violate," from de- "down" + fouler "to tread," from L. fullo "person who cleans and thickens cloth by stamping on it." Sense infl. by foul (q.v.); spelling infl. by obsolete native befile, which it replaced and which meant about the same thing.
defile (n.)
"narrow passage," 1685, from Fr. défilé, n. use of pp. of défiler "march by files."