an instance of becoming narrow
"The narrowing of the river made it impossible for large boats to pass through safely."
a decrease in width
"As the river approaches the gorge, its banks are narrowing and the water is flowing faster."
the act of making something narrower
"The gardener was carefully narrowing the path between the flower beds to make room for a new fence."
The process of becoming narrow.
"As the river approaches the canyon, its narrowing waters rush faster and sound louder."
present participle of narrow
"As the storm approached, the sky began narrowing to a deep, threatening gray just above our heads."
(of circumstances) tending to constrict freedom
"As the deadline approaches, options for our project are narrowing, leaving us with very little room to maneuver."