coltn.[OE. colt a young horse, ass, or camel, AS. colt; cf. dial. Sw. kullt a boy, lad.]1. The young of the equine genus or horse kind of animals; -- sometimes distinctively applied to the male, filly being the female. Cf. Foal.()()2. A young, foolish fellow.(Shak.)3. A short knotted rope formerly used as an instrument of punishment in the navy.(Ham. Nav. Encyc.)Colt's tooth, an imperfect or superfluous tooth in young horses. -- To cast one's colt's tooth, to cease from youthful wantonness. Your colt's tooth is not cast yet. Shak. -- To have a colt's tooth, to be wanton. Chaucer.()v. i. To frisk or frolic like a colt; to act licentiously or wantonly.()They shook off their bridles and began to colt. (Spenser.)v. t.1. To horse; to get with young.(Shak.)2. To befool.(Shak.)