intransitive verb
1. : to become taper : taper
2. : to stop gradually : cease little by little
the organization tapered off in about a year — G.B.Oxnam
transitive verb
: to make or cause to taper : decrease gradually
if not retire, at least taper off the amount of time given to work — Lynn White
use in tapering off morphine and opium addicts — D.W.Maurer & V.H.Vogel