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English definition of “tail off”

tail off

phrasal verb with tail     /teɪl/ verb [T]
to reduce in amount or become lower in level: His voice tailed off as he drifted into sleep. The profits tailed off after a few years.Becoming and making smaller or lessBecoming and making less strong
(Definition of tail off from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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