late 14c., from Anglo-French brocour "small trader," from abrokur "retailer of wine, tapster;" perhaps from Portuguese alborcar "barter," but more likely from Old French brocheor, from brochier "to broach, tap, pierce (a keg)," from broche "pointed tool" (see broach (n.)), giving original sense of "wine dealer," hence "retailer, middleman, agent." In Middle English, used contemptuously of peddlers and pimps.
1630s (implied in brokering), from broker (n.). Related: Brokered.
A financial agent or intermediary; a middleman.