hairpin

[hair-pin]
noun
1.
a slender U -shaped piece of wire, shell, etc., used by women to fasten up the hair or hold a headdress.
adjective
2.
(of a road, curve in a road, etc.) sharply curved back, as in a U shape: a hairpin turn.

Origin:
1770–80; hair + pin

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hairpin (ˈhɛəˌpɪn)
 
n
1.  a thin double-pronged pin used by women to fasten the hair
2.  (modifier) (esp of a bend in a road) curving very sharply

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
After a series of hairpin turns, the trees began to thin and the sky expanded.
At night bats flit through the gaps at the top of the wall, do hairpin turns in the air, and exit again without slowing.
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