The phrase "able to forestall" is correct and usable in written English.
It can be used when discussing the ability to prevent or delay something from happening.
Example: "The new policy is designed to be able to forestall any potential issues before they arise."
Alternatives: "capable of preventing" or "able to avert".
How is it that certain minds seem able to forestall senescence despite genetic programming?
None of the country's institutions or the men associated with them were able to forestall these calamities.
Something must be awry if Enron's chief executive acted so erratically, Wall Street surmised, and Mr. Koenig, a longtime Enron veteran, had not been able to forestall it.
In mid-May the government reached this limit, but, by shifting funds, the Treasury Department was able to forestall the anticipated deadline for default on the public debt until August 2.
Stuart Smith, an environmental lawyer in New Orleans, said that by paying the claims, BP may be able to forestall some lawsuits, which can be filed only if claims against the company have not been resolved within 90 days.
With the San Francisco 49ers two games behind the Packers in the conference standings, the Packers could have another break — they might be able to forestall a decision a bit longer.
Sir Henry Morton Stanley, on his visit in 1877, formed an alliance with the ruler of Kintamo, a wealthy ivory trader, and, despite French efforts to forestall him, was able to acquire a trading post site on his return in 1881.
The United States and Europe — with tenuous Russian and Chinese support — have isolated Iran economically and diplomatically to try to forestall Tehran from being able to build a nuclear weapon.
The idea that those same governments might somehow be able to adopt far more painful measures in order to forestall catastrophe is absurd.
Hoping to forestall such a proposal, Mallory was able to persuade the Congress instead to investigate the conduct of the department.
On occasion, family members were able to stop or forestall the operation; in most cases, however, medical superintendents would simply override such protestations and proceed with surgery.
