The phrase "narrow bridge" refers to a small and tight path or passage that requires caution and careful navigation, as there is very little room to move. Full definition
In 1940, the Tacoma Narrows Bridge collapsed in dramatic fashion, twisting in the wind before it snapped and plunged into the water below. (sciencedaily.com)
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Then in April of 2009, the final narrow bridge of ice anchoring Antarctica's Wilkins Ice Shelf in place broke apart. (oceanmotion.org)