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Discover Ludwig'four-fold' is a correct word and can be used in written English.
It is an adjective meaning four times as much or four times as many. It is often used in a mathematical or numerical context, but can also be used figuratively. Example: The company's profits have increased four-fold since last year, thanks to their new marketing strategy.
Exact(58)
The contribution of this research has been four-fold.
The sum would grow four-fold in the 1990s.
The town's Hispanic population has grown at least four-fold under Nafta.
Overall, the total refugee outflow rose more than four-fold in 2013.
The number of people registering increased almost four-fold from the previous day.
Smoking can cause a two- to four-fold increased risk of heart disease in women.
Four-fold cross-validation test results.
Fig. 1 Four-fold semitendinosus tendon graft.
A four-fold semitendinosus tendon graft looped over a TightRope.
Similar(2)
Under Bill Clinton it grew four fold.
Take it from school officials in Gloucester, Massachusetts who witnessed a four fold increase in teen pregnancies last year.
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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