"firmly rule" is a correct and usable phrase in written English.
It is used to describe an action taken authoritatively and with conviction. For example: "The monarch firmly ruled that the law be enforced in every kingdom."
May refuses to firmly rule out extending article 50.
They did not firmly rule it out and a spokesperson condemned such an attack as "abhorrent" if found to have occurred.
Our constraints on the orbit of β Pic b firmly rule out the possibility of a transit of the planet at 10-σ significance.However, we confirm that the Hill sphere ofβPic b will transit, giving us a rare chance to probe the circumplanetary environment of a young, evolving exoplanet.
This forced silence has become more problematic for the candidates as the primary has grown closer, particularly given the speculation about Mr. Giuliani, which he has seemed to encourage in recent days by declining to firmly rule out staying in office.
Supreme Court justices should firmly rule that the authorities cannot use such equipment without prior court permission.
In suggesting a "multilateral dialogue" on the Kashmir issue and offering to mediate between India and Pakistan, Erdoğan irked Indian officials, who "firmly rule out third party mediation on Kashmir".
Mr Ahmadinejad firmly rules this out.
But American and British officials have firmly ruled out co-operation with Assad.
It was a gamble that John Major so firmly ruled out electoral and constitutional change.
And if style firmly ruled over substance, at least it was deliberate.
The possibility that it will be Mr Bayrou rather than Mr Sarkozy or Ms Royal cannot be firmly ruled out.
