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From The Collaborative International Dictionary of English v.0.48:
Knave \Knave\ (n[=a]v), n. [OE., boy, servant, knave, AS. cnafa boy, youth; cf. AS. cnapa boy, youth, D. knaap, G. knabe boy, knappe esquire, Icel. knapi, Sw. knape esquire, kn[aum]fvel knave.] 1. A boy; especially, a boy servant. [Obs.] --Wyclif. Chaucer. [1913 Webster] O murderous slumber, Lay'st thou thy leaden mace upon my boy That plays thee music ? Gentle knave, good night. --Shak. [1913 Webster] 2. Any male servant; a menial. [Obs.] --Chaucer. [1913 Webster] He's but Fortune's knave, A minister of her will. --Shak. [1913 Webster] 3. A tricky, deceitful fellow; a dishonest person; a rogue; a villain. "A pair of crafty knaves." --Shak. [1913 Webster] In defiance of demonstration, knaves will continue to proselyte fools. --Ames. [1913 Webster] Note: "How many serving lads must have been unfaithful and dishonest before knave -- which meant at first no more than boy -- acquired the meaning which it has now !" --Trench. [1913 Webster] 4. A playing card marked with the figure of a servant or soldier; a jack; as, the knave of hearts. [1913 Webster] Knave child, a male child. [Obs.] --Chaucer. Syn: Villain; cheat; rascal; rogue; scoundrel; miscreant. [1913 Webster]