black ice
US /ˌblæk ˈaɪs/
UK /ˌblæk ˈaɪs/
1.
a thin, transparent layer of ice on a road surface or other paved area, often difficult to see, that forms when precipitation freezes on contact with a surface that is at or below freezing point
:
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Drivers should be cautious of black ice on bridges during winter mornings.
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The car skidded on a patch of black ice.