tighten

Verb

• narrow or limit
  • reduce the influx of foreigners
    

• restrict
  • Tighten the rules
    
  • stiffen the regulations
    

• become tight or tighter
  • The rope tightened
    

• make tight or tighter
  • Tighten the wire
    

Related words

• Synonyms: 
  reduce , stiffen , tighten up , constrain , fasten