narrowing

Adjective

• (of circumstances) tending to constrict freedom

• becoming gradually narrower
  • long tapering fingers
    
  • trousers with tapered legs
    

Noun

• the act of making something narrower

• a decrease in width

• an instance of becoming narrow

Related words

• Synonyms: 
  constricting , constrictive , tapered , tapering
• Antonyms: 
  widening , broadening