Source : Webster's Revised Unabridged Dictionary (1913)

Defile \De*file"\, v. i. [imp. & p. p. {Defiled}; p. pr. & vb.
   n. {Defiling}.] [F. d['e]filer; pref. d['e]-, for des- (L.
   dis-) + file a row or line. See {File} a row.]
   To march off in a line, file by file; to file off.