cant. [Of unknown origin: cf. BUNCE.] An extra profit or gain; something to the good. (See quot.)
1851. Mayhew, Lond. Labour, I. 33. Boys deputed to sell a mans goods for a certain sum, all over that amount being the boys profit or bunts [on p. 470. spelt bunse].
1881. Cheq. Career, 270. In the stable, and particularly in livery-stables, there is a box into which all tips are placed. This is called Bunt.