The phrase "a firm case for" is correct and usable in written English.
It can be used when presenting a strong argument or justification for a particular position or action.
Example: "The research provides a firm case for implementing renewable energy sources in our community."
Alternatives: "a strong argument for" or "a solid justification for".
Weiner said he believed the Mets would have had a firm case for protecting their first-round draft pick, 11th over all, which they would have lost if they had signed Michael Bourn.
CLEMSON, S.C. — This was Jameis Winston's introduction to stardom: silencing Death Valley on Saturday night, quarterbacking Florida State to a signature win over Clemson and making a firm case for the Heisman Trophy.
Tattersall - who had previously finished no higher than 16th at Badminton - made a firm case for Olympic selection.
Arsenal's Kieran Gibbs, Danny Rose of Tottenham and Southampton's Ryan Bertrand are in contention but have yet to make any firm case for selection.
His late, firm case for Ryder Cup inclusion was thereby confirmed.
He never makes firm cases for positions, floating feelers for focus groups to test and interests to engage instead, letting well-funded lobbyists and other players decide what will work best.
Some say that the power exercised by a firm provides a case for those who are affected by this power to have some degree of control of the firm's operations.
Our results provide a firm worst-case guarantees and theoretical boundaries for the performance of polynomial-time preprocessing algorithms for the considered problems.
Those seemingly innocuous facts would help hackers case a firm for a larger data theft--searching for more private details like credit card or social security numbers was forbidden in the contest rules.
Allies of the White House said the report backed their case against a firm deadline for withdrawal.
In one recent libel case where a firm acting for a claimant on a conditional-fee basis settled for £100,000 in damages, the claimant's lawyers recovered the best part of £1m in costs.
