slipping
 n.— «In the old days, lookouts had to run several blocks to relay their surveillance information; now it’s relayed in a matter of seconds. And it’s not just the whereabouts of a potential murder victim, it’s whether the potential victim is by himself, or, in street terms, “slipping.” “When they’re slipping, there’s no protection,” Cashman said. “They’re not with their friends or associates. It’s a term used in high-crime areas, often with gangs. When they’re slipping they’re vulnerable.”» —“SFPD: Cell Phone A Popular Tool For Murderers” by Simon Perez KPIX-TV (San Francisco, California) Feb. 15, 2007. (source: Double-Tongued Dictionary)