先さき細ぼそる

godan verb (-ru)

taper off; dwindle; get narrower toward the end

Describes something that gradually becomes smaller, thinner, or less toward the end, both physically and figuratively (e.g., a stick, a road, or prospects).

• この道みちは先さき細ぼそっていて、車くるまでは通とおれない。

  This road tapers off and is impassable by car.

• 景けい気きの先さき行