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[Middle English defilen, alteration (influenced by filen, to befoul) (from Old English fȳlan; see pū̆-), of defoulen, to trample on, abuse, pollute, from Old French defouler, to trample, full cloth, de-, de-, + fouler, to trample, beat down; see full2.]
[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.]
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