Noun

• S: (n) narrowing (an instance of becoming narrow)
• S: (n) narrowing (a decrease in width)
• S: (n) narrowing (the act of making something narrower)

Verb

• S: (v) narrow, contract (make or become more narrow or restricted) "The selection was narrowed"; "The road narrowed"
• S: (v) pin down, peg down, nail down, narrow down, narrow, specify (define clearly) "I cannot narrow down the rules for this game"
• direct troponym / full troponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• sentence frame
• S: (v) specialize, specialise, narrow, narrow down (become more focused on an area of activity or field of study) "She specializes in Near Eastern history"
• S: (v) constrict, constringe, narrow (become tight or as if tight) "Her throat constricted"

Adjective

• S: (adj) tapered, tapering, narrowing (becoming gradually narrower) "long tapering fingers"; "trousers with tapered legs"
• S: (adj) constricting, constrictive, narrowing ((of circumstances) tending to constrict freedom)