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Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 156

ill, n. A steel instrument, covered with edged furrows, for abrading or smoothing hard stances; a shrewd, artful person, cheat, pickpocket. — v. t. [filed (fild), filing.] To rub, smooth, cut away, with a file; to smooth, polish, improve.