early 15c., "one who keeps watch," from M.Fr. garde "guardian, warden, keeper," from garder "to guard," from O.Fr. guarder (corresponding to O.N.Fr. warder, see gu-
), from Frank. *wardon, from P.Gmc. *wardo- (see ward
(v.)). Abstract or collective
sense of "a keeping, a custody" (as in bodyguard) is from early 15c. Sword-play and boxing sense is from 1590s. The verb is first recorded 1580s, from the noun. Guarded "reserved and cautious in speech, behavior, etc." is from 1728. Guardian (early 14c.) is from Anglo-Fr. gardein, from O.Fr. gardien, earlier guarden, from Frankish *warding-.