Wiktionary
n. (alternative name of: hairpin bend)
Wikipedia
A hairpin turn (also hairpin bend, hairpin corner, etc.), named for its resemblance to a hairpin/ bobby pin, is a bend in a road with a very acute inner angle, making it necessary for an oncoming vehicle to turn almost 180° to continue on the road. Such turns in ramps and trails may be called switchbacks in American English, by analogy with switchback railways. In British English "switchback" is more likely to refer to a heavily undulating road—a use extended from the rollercoaster and the other type of switchback railway.
Usage examples of "hairpin turn".
For almost two hours Jim Qwilleran had been driving on mountain passes, snaking around triple S-curves, blowing the horn at every hairpin turn, making the wrong decision at every fork in the road.
Careening around a hairpin turn below them, tires sliding on the mist-slick asphalt, the Volkswagen van raced what looked like a truck.
The oncoming Jeep, careening around a snaking hairpin turn, had already slammed into him.
The fifth hairpin turn was the sharpest yet-a turn so pinched that it seemed the red car would scarcely be able to make it and still stay on the trail.
As yet they kept a moderate pace, but the first hairpin turn came a good deal sooner than Bren expected, the mechieti still moving briskly, but not so the staff walking down couldn't stay with them.
The car screeched around another hairpin turn, his stomach wrenching with the centrifugal force.
Now all the fieldwork would have to be accomplished by three people--herself, Liu, and Ben--while Castor, still handicapped by his leg injuries, remained on board as the exploratory vessel did its hairpin turn about the third planet.
Now all the fieldwork would have to be accomplished by three peopleherself, Liu, and Benwhile Castor, still handicapped by his leg injuries, remained on board as the exploratory vessel did its hairpin turn about the third planet.
Ysidro paused, looking about him at the narrow confines of the stair and the hairpin turn of the enclosing wall.