Verb tighten has 4 senses
  1. tighten, fasten - make tight or tighter; "Tighten the wire"
    --1 is one way to change, alter, modify
    Derived form: noun tightening1
    Sample sentence:
    Somebody ----s something
  2. tighten - become tight or tighter; "The rope tightened"
    --2 is one way to
    change
    Sample sentence:
    Something ----s
  3. stiffen, tighten, tighten up, constrain - restrict; "Tighten the rules"; "stiffen the regulations"
    --3 is one way to restrict, restrain, trammel, limit, bound, confine, throttle
    Sample sentence:
    Somebody ----s something
  4. reduce, tighten - narrow or limit; "reduce the influx of foreigners"
    --4 is one way to restrict, restrain, trammel, limit, bound, confine, throttle
    Sample sentences:
    Somebody ----s something
    Something ----s something
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