tapering

nouns

the act of gradually lowering the size or amount
"the doctor prescribed the tapering of the dose"
tapering
is derived from
taper
is a type of (narrower)
the act of causing to become less
lowering

adjectives

becoming gradually narrower
"long tapering fingers"; "trousers with tapered legs"
narrowing, tapered, tapering
gradually decreasing until little remains
dwindling, tapering, tapering off