scarecrow n.— «The NYPD is using unmanned police cars on major highways as a deterrent to speeders, the Daily News has learned. The vacant vehicles—derisively referred to as scarecrows by some cops—were blasted by the city’s police union...
death cross n. in financial markets, a situation where long-term and short-term averages converge, seen as evidence that values will decline. (source: Double-Tongued Dictionary)