widow-maker

noun
wid*ow-mak*er \ ˈwi-dō-ˌmā-kər \ -də- \
1798
  • something having the potential to cause sudden loss of life : such as
  • a loose limb hanging in or falling from a tree
  • a blockage in a branch of the left coronary artery that commonly causes a fatal heart attack; also : the branch of the left coronary artery susceptible to fatal blockage
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