Tunnel

usgb/ˈtʌnl/Volume
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Physical StructuresPlay
Used to describe structures allowing transportation through obstacles. SlideThe new tunnel connects two major cities.
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Metaphorical UsePlay
Sometimes 'tunnel' may represent a challenge or journey in life. SlideHe's going through a dark tunnel, but he'll emerge stronger.
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Not Always UndergroundPlay
Tunnels can be above ground, like wildlife crossings over highways. SlideThe wildlife tunnel helps animals cross safely.