To defile is defined as to make something unclean, either literally or figuratively.(verb)
When you scribble over a beautiful painting, this is an example of a situation where you defile the painting.
See defile in Webster's New World College Dictionary
Origin: ME defilen, altered (by assoc. with filen, to make foul < OE fylan < ful, foul) < defoulen < OFr defouler, to tread underfoot, insult < de-, intens. + fouler < ML fullare, to tread, full
Origin: Fr défiler, to file off, unravel < dé- (L de), from + filer, to form a line < fil, thread: see file
Origin: Fr défilé < the v.
See defile in American Heritage Dictionary 4
transitive verb de·filed, de·fil·ing, de·files
Origin: Middle English defilen
Origin: , alteration (influenced by filen, to befoul, from Old English fȳlan; see pū̆- in Indo-European roots)
Origin: of defoulen, to trample on, abuse, pollute
Origin: , from Old French defouler, to trample, full cloth
Origin: : de-, de-
Origin: + fouler, to trample, beat down; see full2.
intransitive verb de·filed, de·fil·ing, de·files
Origin: French défiler
Origin: : dé-, away, off (from Old French de-; see de-)
Origin: + file, line, file (from Old French filer, to spin thread, march in line; see file1)
Origin: . N., from French défilé
Origin: , from
Origin: past participle of défiler.
Learn more about defile