Newgate market was a meat market held at Newgate (London, England). For Victorian descriptions of Newgate market, see: https://www.victorianlondon.org/markets/newgatemarket.htm

In London Labour and the London Poor edition: 

Phase 1

Boy Crossing-Sweepers and Tumblers. (Volume 2): "Once or twice a-week we gets meat. We all club together, and go into Newgate Market and gets some pieces cheap, and biles them at home. We tosses up who shall have the biggest bit, and we divide the broth, a cupful in each basin, until it’s lasted out. If any of us has been unlucky we each gives the unlucky one one or two halfpence. Some of us is obliged at times to sleep out all night; and sometimes, if any of us gets nothink, then the others gives him a penny or two, and he does the same for us when we are out of luck."

Phase 2

Girl Crossing-Sweeper. (Volume 2)