Definition of 'Death Cross' A crossover resulting from a security's long-term moving average breaking above its short-term moving average or support level. Read more: http://www.investopedia.com/terms/d/deathcross.asp#ixzz26ev7vRbs images.investorshub.advfn.com/images/uploads/2013/2/23/ovsdnnow_you_know.PNG