noun
a road, path, or section of a railway with a series of sharp bends or turns in alternating directions
verb
to follow a zigzag path, especially up a steep incline
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The hikers carefully navigated the steep switchback trail up the mountain.
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We took the switchback route to avoid the steep climb.
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Let's hit up the switchback trail for a more chill hike.
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His thoughts went through a switchback of emotions as he tried to make a decision.