inure (v.) Look up inure at Dictionary.com
formerly also enure, mid-15c., "accustom, adapt, establish by use," contracted from phrase (put) in ure "in practice" (early 15c.), from obsolete noun ure "work, practice, exercise, use," probably from Old French uevre, oeuvre "work," from Latin opera "work" (see opus). Meaning "toughen or harden by experience" is from late 15c. Related: Inured; inuring.