death cross
n.— «You probably won’t take any comfort in learning that a technical indicator for the Dow Jones industrial average is pointing to a so-called “death cross.” The nasty-sounding indicator pops up when an index’s 50-day moving average (or intermediate-term trend) dips below its 200-day moving average (or long-term trend). As the name suggests, it is often considered among technical analysts to be a bearish signal for stocks.» —“Markets fine, except for ‘death cross’” by David Berman National Post (Ontario, Can.) July 28, 2004. (source: Double-Tongued Dictionary)
Further reading
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