The phrase "a serious fall in" is correct and usable in written English.
It can be used to describe a significant decrease in a particular metric, such as prices, sales, or performance.
Example: "The company reported a serious fall in revenue this quarter, prompting concerns among investors."
Alternatives: "a significant drop in" or "a substantial decline in".
Water availability strictly limits oasis expansion, and, in some, overuse of water has produced a serious fall in the water level.
Speaking from his hospital bed in Lahore, where he suffered a serious fall in the final days of the election campaign and badly injured his back, Mr. Khan broadly welcomed the election.
The second, "A Serious Fall in the Value of Gold" (1863), attempted to measure the rise in prices in the period following the gold discoveries in California and Australia.
The case centered on a reading of 60.1percentt red blood cell levels detected in Pantani's blood after he was taken to hospital on Oct. 15, 1995, following a serious fall in the Milan-Turin race raclassicsiclassic
Of the total 17 species, eight have declined, including the common blue, which has suffered a serious fall in numbers; two species remained stable, including the Orangetip; and only one increased.
From a broad perspective the simultaneous advances on the scale of buildings and of cities may cause a serious fall in energy-demands in urban areas in Europe on the middle-long term.
Edlinger had a serious fall while free soloing in the 1990s and had a heart attack related to the accident.
Sewell's devotion to horses was given added poignancy following a serious fall when she was in her teens.
Finally, your doctor may urge you to avoid sports or activities that may result in a serious fall or injury.
After a serious fall which almost killed him in 1995, Mr Edlinger retired from the extreme forms of "free climbing" and ran a guesthouse in the French Alps.
It was clear, however, that both Mallory and Irvine had been involved in a serious fall that broke the rope which undoubtedly joined them.
