switch·back

[swich-bak]
noun
1.
a highway, as in a mountainous area, having many hairpin curves.
2.
Railroads. a zigzag track arrangement for climbing a steep grade.
3.
British, roller coaster.
verb (used without object)
4.
(of a road, railroad track, etc.) to progress through a series of hairpin curves; zigzag: The road switchbacks up the mountain.

Origin:
1860–65, Americanism; switch + back2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To switchback
00:10
Switchback is one of our favorite verbs.
So is lollygag. Does it mean:
to run away hurriedly; flee.
to spend time idly; loaf.
Collins
World English Dictionary
switchback (ˈswɪtʃˌbæk) [Click for IPA pronunciation guide]
 
n
1.  a mountain road, railway, or track which rises and falls sharply many times or a sharp rise and fall on such a road, railway, or track
2.  another word (esp Brit) for big dipper

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Then: solid darkness, with headlights gouging it out to expose switchback roads
  and useless signs.
Pavers can be used to armor switchback turns and steeper slopes, especially on
  trails designed for motorized traffic.
In the crook of a switchback was a spring, upwelling and dark-tinted among
  creepers and weeds.
The effect has been to create a switchback in the public finances, injecting
  extra demand into the economy.
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