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Noun: tightening  tI-t(u)n-ing
  1. The act of making something tighter
    "the tightening of economic controls"
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

Derived forms: tightenings

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

Antonym: loosening