The phrase "a significant weakening of" is correct and usable in written English.
It can be used when discussing a reduction in strength, effectiveness, or intensity of something, such as an argument, policy, or physical structure.
Example: "The recent changes in policy have led to a significant weakening of the regulations that protect the environment."
Alternatives: "a considerable decline in" or "a notable reduction in".
All this leads to a significant weakening of the brand.
It could also mark a significant weakening of the Anglo-Saxon dominance of the world wide web.
"The fall in oil prices has caused a significant weakening of the rouble's exchange rate, which gives rather strong inflationary effect.
That would represent a significant weakening of Ms. Reding's intended penalties, which mandate fines or the blocking of appointments if a board tilted too heavily toward one gender.
"Unfortunately, record low gilt yields following the EU referendum result, the impact of Solvency II legislation and a significant weakening of competition in the annuity market have all exerted considerable downward pressure on annuity rates during 2016".
The suit contends that the changes amounted to a significant weakening of the Clean Air Act by making it easier for some industrial polluters to avoid installing modern pollution controls.
Furthermore, a significant weakening but not decoupling of the BMI-SBP-association was also found for 9- to 11-year-old U.K. children when comparing 1980 and 2008 data [ 15].
"In London, however, we expect prices to decline by 3.6%, driven by a significant weakening at the prime end of the market.
Minutes from the Federal Reserve meeting that ended on Aug. 1 cited the risk of a "significant weakening in the housing sector" in the months to come.
[In New York trading on Monday, DaimlerChrysler shares closed down $1.13, at $42.36.] While Chrysler's fourth-quarter loss is far worse than many analysts have been predicting, it is not entirely surprising given the signs of a significant weakening in the entire American market since September.
Especially, fluids residing in brittle crust have a significant weakening effect on the mechanics of rocks and affect the long-term structural and compositional evolution of the crust (e.g., Hickman et al. 1995).
