hairpin turn
US /ˈher.pɪn ˌtɜːrn/
UK /ˈher.pɪn ˌtɜːrn/
1.
a very sharp bend in a road, especially on a mountain, that doubles back on itself
:
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The bus struggled to navigate the steep hairpin turn on the mountain road.
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Drivers must slow down significantly before a hairpin turn.