black ice

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black ice ‎(uncountable)

  1. A smooth, barely visible, and dangerously slippery film of ice, usually over a dark surface, such as rock or pavement.
    • 1965, December 25, Oregon Bus Crash Kills 12, Hurts 27[1], page 30:
      He said the bus struck a patch of black ice, or freshly formed ice as yet invisible on the road surface, just after he had passed a trailer truck.


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