/ ˈdʒɒbə(r); NAmE ˈdʒɑːb-/ (also stock·job·ber ) noun
( finance ) (in Britain in the past) a person who worked on the stock exchange , buying shares, etc. from brokers and selling them to other brokers
—compare broker-dealer
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WORD ORIGIN
late 17th cent. (in the sense broker, middleman , originally not derogatory): from job .