The phrase "a big upturn" is correct and usable in written English.
It can be used to describe a significant increase or improvement in a particular situation, such as economic growth or positive changes in a trend.
Example: "The company experienced a big upturn in sales after launching their new product line."
Alternatives: "a significant increase" or "a major improvement."
There was a big upturn this weekend".
The coldest winter in 30 years may have affected January's trade numbers; business surveys are now reporting a big upturn in export orders.
Trescothick is proud of his side's ability to compete for trophies across the formats but is also wary of a Bears side who have enjoyed a big upturn in form in the last four weeks.
By coincidence, just as I was raving about my genius discovery, Givenchy released the fantastic One-Minute Glow Powder (£26.55), as part of my beloved Hydra Sparkling range; Diptyque launched its first facial skincare line with Radiance Boosting Powder (£38) at centre stage; and great Japanese brand DHC saw a big upturn in interest in its Washing Powder (£8).
But retirements for the Spaniard at the first corner in Belgium and Japan, and a big upturn in performance from Red Bull have seen Vettel win the last four races, and take three pole positions and four front-row starting spots, to take his victory tally to five for the season.
"The benefits of two wheels (or three) are so great that we are seeing a big upturn in our business.
They also said forecasts for next quarter suggested corporate sentiment might not worsen, but it would be "quite some time" before any big upturn came in the real economy, because corporate earnings kept deteriorating and production capacity and employment levels were considered "highly excessive".
Of course, there isn't a guarantee this will take place over the next year, or two, just 45 years of startlingly similar behavioral patterns that lead almost like clockwork every four or five years to a big chip upturn.
In contrast, the big upturn in the 1980s lasted for seven years, and real house prices rose by 80%.Two years ago the long boom seemed to be petering out.
Things got decidedly better, and Unseen Tours played a big part in the upturn.
But there is a big industry out there dependent on an upturn.
