"narrowing" in the noun sense
1. narrowing
an instance of becoming narrow
2. narrowing
a decrease in width
3. narrowing
the act of making something narrower
"narrowing" in the verb sense
1. narrow, contract
make or become more narrow or restricted
"The selection was narrowed"
"The road narrowed"
2. pin down, peg down, nail down, narrow down, narrow, specify
define clearly
"I cannot narrow down the rules for this game"
3. specialize, specialise, narrow, narrow down
become more focused on an area of activity or field of study
"She specializes in Near Eastern history"
4. constrict, constringe, narrow
become tight or as if tight
"Her throat constricted"
"narrowing" in the adjective sense
1. tapered, tapering, narrowing
becoming gradually narrower
"long tapering fingers"
"trousers with tapered legs"
2. constricting, constrictive, narrowing
of circumstances) tending to constrict freedom
Source: WordNet® (An amazing lexical database of English)
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