treacherous mountain passes
definitions
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dangerous and unpredictable routes through mountain ranges, often characterized by steep slopes, unstable terrain, or sudden weather changes that pose a risk to travelers.fr: cols de montagne dangereux
examples
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The climbers struggled to navigate the treacherous mountain passes during the blizzard.
Les alpinistes ont eu du mal à franchir les cols de montagne traîtres pendant le blizzard.