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taper [tapered, tapering, tapers]▼(to diminish gradually)
verb
[UK: ˈteɪ.pə(r)] [US: ˈteɪ.pər]

taper off▼(diminish or lessen gradually; to become smaller, slower, quieter, etc.)
verb
[UK: ˈteɪ.pə(r) ɒf] [US: ˈteɪ.pər ˈɒf]