細ほそる

godan verb (-ru), intransitive verb

get thin; become slender; taper off

Describes something becoming physically thinner or narrower, or a quantity/condition diminishing gradually. Often used for body parts, objects, or abstract things like income.

• 病びょう気きで足あしが細ほそってしまった。

  My legs have gotten thin from illness.

• この道みちは先さきのほうで細ほそっている。