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"tightened regulations" is correct and usable in written English.
You can use it to describe a situation in which regulations have become stricter. For example, "The government has recently tightened regulations on emissions."
Exact(46)
In June the Education Department tightened regulations, though not as strictly as industry critics had advocated.
As a result, the FDA stopped many gene therapy trials and tightened regulations on consent.
The owners of Corntop have been vocal campaigners against the tightened regulations.
The Danish fashion industry has tightened regulations in order to ensure that models are healthy – both physically and psychologically.
Legislators on both islands bridle at the term "tax haven" and insist they have improved disclosure and tightened regulations.
It has tightened regulations on companies and financial institutions, and the big ones have stopped doing business with North Korea.
Similar(11)
America's Dodd-Frank Act has tightened regulation of the financial services sector so far that banks can barely move.
Worried about the rising level of consumer debt, Japanese government has recently tightened regulation on consumer finance companies.
Other cities including New York, San Francisco and Anaheim have tightened regulation of rentals for fewer than 30 days.
Not surprisingly, the hedge fund industry generally opposes efforts to tighten regulations.
Labour backs fracking but would tighten regulations, though not enough to satisfy many opponents.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com