"major hint" is a correct and usable phrase in written English.
You can use it when you have a important suggestion or detail to give someone that is likely to help them figure out something. For example: "He wasn't sure how to solve the equation, but I gave him a major hint and he figured it out right away."
By way of a major hint earlier on Wednesday, Glenn, the FA's chief executive – revealed that he, Ashworth, the technical director, and Gill, the vice-chairman, had demanded that the new man make concerted, innovative and "unashamed" use of sports psychology to build mental resilience in the face of the "world's most intensely passionate" press.
Samsung dropped a major hint with its event invitation — 'Do bigger things' — while previous leaks have hinted at a 6.3-inch, 19.5 9 aspect ratio display which would really be something.
Now, HBO might be offering a major hint.
On Monday the R&B crooner dropped a major hint that he's got something up his sleeve for summer.
During an interview with "Entertainment Tonight, Tom Cruisee served up a major hint about the upcoming sequel to "Top Gun".
Rey's true parents in "Star Wars: The Force Awakens" are still a big mystery, but Ewan McGregor might've given us a major hint in the right direction.
This we know less about, although Netflix has been dropping some major hints on the series' recently launched Instagram account.
While Mads Mikkelsen, Hugh Dancy and Laurence Fishburne were not in attendance (Mikkelsen and Dancy sent video messages), showrunner Bryan Fuller was joined by a panel including Caroline Dhavernas, Scott Thompson, Aaron Abrams and Raúl Esparza, and wasn't coy in dropping some fairly major hints about where the show is going.
And just a few minutes ago, via his Twitter account, he (possibly) dropped some major hints on the Apple tablet that's going to be presented tomorrow.
A month after it dropped major hints, Amazon has made its Prime Video service available in more than 200 countries worldwide bringing some serious competition to Netflix's global plan.
He dropped major hints about the new project before the VMAs, suggesting it will arrive on Black Friday, Nov. 28.
