The phrase "affirm a decision" is correct and usable in written English.
You can use it when you want to express support or confirmation of a previously made decision.
Example: "The committee met to discuss the proposal and ultimately decided to affirm a decision made last month."
Alternatives: "confirm a decision" or "ratify a decision."
The court affirmed a decision made in March 2002 by Judge Ira Gammerman granting summary judgment to Mr. Leibner.
Last year, a federal appeals court affirmed a decision by a lower court to prevent Delta from ending the flying agreement with Mesa.
And just two weeks ago, the court summarily affirmed a decision upholding a law that makes it a crime for foreigners to spend money to influence elections.
The 4-to-3 ruling affirmed a decision by a Weld County district judge who had suppressed evidence against one of the defendants.
It affirmed a decision last fall that a 1965 Canada-United States auto pact violated free trade rules by giving subsidies to American manufacturers, including Ford and General Motors.
On Wednesday, a Federal District Court judge in New York affirmed a decision by United States Citizenship and Immigration Services to deny an "extraordinary ability" work visa to Afshin Noroozi, 27, the first table tennis Olympian from Iran.
In March, the Obama administration affirmed a decision by the Bush administration to remove gray wolves from the endangered list, where they had been protected for more than 30 years.
The New Mexico Supreme Court on Thursday affirmed a decision against a photography studio that was sued after refusing to photograph a same-sex couple's commitment ceremony in 2006, saying the First Amendment does not permit businesses that offer services for a profit to choose whom to serve.
The federal appeals court in Philadelphia affirmed, in a decision that in retrospect seems more sensible than the one later produced by the Supreme Court.
Judge Gerald B. Cope Jr. wrote the opinion, which affirmed a 2008 decision from a lower court.
