How ‘Flip’ Entered the Story of the Russia Investigation – Word’s history is tied to prosecutors, mobsters and novelists By Ben Zimmer Nov. 3, 2017 10:22 a.m. ET On Monday, court documents revealed that George Papadopoulos, a former foreign-policy adviser to Donald Trump, had entered into a plea agreement after his July arrest and had tried to cooperate with Special Counsel Robert Mueller’s investigation. This promoted speculation that the Mueller team may have “flipped” Mr. Papadopoulos. As a HuffPost headline read about the investigation into alleged Russian interference in the 2016 presidential campaign, “Robert Mueller Flipped…