What is the meaning of tighten up?

Restrict.
- usage: "Tighten the rules"; "stiffen the regulations"
- synonyms: stiffen, tighten, constrain

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APA	WordNet. (2010). tighten up. Retrieved September 21, 2026, from http://smartdefine.org/tighten_up/definitions/1316295
Chicago	WordNet. 2010. "tighten up" http://smartdefine.org/tighten_up/definitions/1316295 (accessed September 21, 2026).
Harvard	WordNet 2010, tighten up, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/tighten_up/definitions/1316295>.
MLA	WordNet. "tighten up" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/tighten_up/definitions/1316295>

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