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Verb: tail off
  1. Gradually decrease or diminish in intensity, volume, frequency, or effectiveness
    "The conversation tailed off as people started to leave"
Noun: tail-off  'teyl,óf
  1. A gradual decrease or decline in intensity, volume, or frequency
    "There was a tail-off in sales during the summer months"

Derived forms: tails off, tail-offs, tailing off, tailed off