godan verb (-ru), intransitive verb
get narrower; contract; taper
Describes something becoming narrower toward one end or shrinking inward. Often used for physical shapes like a tube, a skirt, or an opening that closes up.
このスカートは裾に向かってすぼまっている。
This skirt tapers toward the hem.
寒くて穴がすぼまった。
The hole contracted because of the cold.