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taper [tapered, tapering, tapers]▼(to become thinner or narrower at one end)
verb
[UK: ˈteɪ.pə(r)] [US: ˈteɪ.pər]

narrow [narrowed, narrowing, narrows]▼(to get narrower)
verb
[UK: ˈnæ.rəʊ] [US: ˈnero.ʊ]