taper
UK: ˈteɪpə | US: ˈteɪpər
n. a gradual narrowing or thinning toward one end
vt. to make or become gradually narrower or thinner
vi. to diminish or lessen gradually
The word "taper" originates from Old English tapor, meaning "a wax candle," which itself likely derived from Latin papyrus (referring to the pith of the papyrus plant used as candle wicks). Over time, the meaning shifted to describe the shape of a candle—narrowing toward the top—and later generalized to any gradual narrowing. The morpheme tape reflects the slender, elongated form, while -er suggests a comparative or functional quality (e.g., "one that tapers").
The candle had a slight taper at the top.
She tapered the sleeves of the dress for a better fit.
The road tapers as it approaches the bridge.
His enthusiasm tapered off after the first week.
Use a taper to create a smooth transition between the two sections.