The phrase "growing opinion" is correct and can be used in written English.
It refers to an opinion or viewpoint that is becoming more widespread or popular over time. Example: There is a growing opinion among millennials that traditional careers are no longer appealing and they prefer to pursue entrepreneurship or freelancing.
John Key, whose brother was on the general's staff, fed the growing opinion that Antietam was indeed a lost chance.
The victory, which was announced yesterday, is likely to fuel the growing opinion in the international wine world that riesling has become New York's signature wine.
Instead, the growing opinion that Antietam represented a missed opportunity for a decisive victory produced a concerted effort to have McClellan removed: only intervention by sympathetic governors from Ohio, Pennsylvania and Maine prevented this embarrassment.
The magazine, EastLondonLines, is a riposte to despair and also the growing opinion that British journalism courses leave students lacking the entrepreneurial skills needed to survive in a world where media organisations are struggling to make content pay.
The article doesn't cover the growing opinion that NPR has done for radio what PBS has done for television since Newt Gingrich threatened to cut federal subsidies because of "liberal" bias.
Since young people will have to stay in education and training until they are 18, there is growing opinion that we no longer need external testing of 16-year-olds.
Three characters, all from Yorkshire – two still living there, one relocated – started forming, growing opinions, faults, strengths, weaknesses, hurts and pleasures and an abundance of attitude.
As the use of the stun guns steadily grows, opinions about their value remain divided.
But as the use of Tasers steadily grows, opinions about their value remain dramatically divided.
In fact, my party's support has been growing, with opinion polls now indicating that it is the second most popular in the frontier province - and gaining ground in every other province.
A stagnated middle class, increasing national debt, deteriorating working culture and growing public opinion against employing American men and women as foot soldiers, for example, have seriously dented the surviving superpower's capacity to sustain the status as the undisputed leader of the new world.
