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bottleneck [bottlenecks]▼(narrowing of the road, especially resulting in a delay)noun[UK: ˈbɒtl.nek] [US: ˈbɑː.təl.ˌnek]
defile [defiles]▼(narrow passage or way, especially a narrow gorge or pass between mountains)noun[UK: dɪ.ˈfaɪl] [US: dɪ.ˈfaɪl]
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