early 15c., "leather pouch," from M.Fr. bougette
, dim. of O.Fr. bouge
"leather bag, wallet, pouch," from L. bulga
"leather bag," of Gaulish origin (cf. O.Ir. bolg
"bag," Bret. bolc'h
"flax pod"), from PIE *bhelgh-
). Modern financial meaning (1733) is from notion of treasury minister keeping his fiscal plans in a wallet. The verb in this sense is from 1884. Another 18c. transferred sense was to "a bundle of news," hence the use of the word as the title of some newspapers.