A transitive verb meaning to make narrower or to contract something; also to purse or shrink body parts (e.g., purse one's lips, narrow one's eyes).
彼女は寒さで口をすぼめた。
She pursed her lips because of the cold.
袋の口をすぼめて中身がこぼれないようにした。
I tightened the bag's opening so its contents wouldn't spill.
強い光を見て目をすぼめる。
I narrow my eyes when looking at a strong light.
風が強くて傘がすぼめてしまった。
The wind made the umbrella collapse/narrow (i.e., it was drawn in).