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Verb: tighten  tI-t(u)n
  1. Make tight or tighter
    "Tighten the wire";
    - fasten
  2. Become tight or tighter
    "The rope tightened"
  3. (of laws or regulations) make more restrictive, or impose greater penalties
    "tighten the rules";
    - stiffen, tighten up, constrain
  4. Narrow or limit
    "tighten the influx of foreigners";
    - reduce

Sounds like: ties, ighten, titan

Derived forms: tightening, tightened, tightens

Type of: alter, bound, change, confine, limit, modify, restrict, throttle, trammel