"repeated suggestion" is a correct and usable phrase in written English.
You could use it when referring to a suggestion that has been mentioned more than once. For example, "My mother has been making the same repeated suggestion for months: I should try getting a job in the financial sector."
There is also a repeated suggestion that Hanna's lesbianism results from her treatment by men.
In another recording she ponders the repeated suggestion that Miss Marple and Poirot, two of her most prominent characters, should be introduced to each other.
So has the repeated suggestion from his camp that this is not a real issue, but a confected crisis manufactured by people trying to destabilise his leadership.
He was especially keen not to discuss his father's business dealings and the repeated suggestion that his literary career was bankrolled with daddy's money.
And if - as the Scottish government says - it's bullying then what's Alex Salmond doing with his repeated suggestion in recent years that he'd renege on UK debt?
The repeated suggestion is that Muslim scientists made discoveries later attributed to Westerners and that many Western institutions were shaped by Muslim contributions.
Glemp also struggled and failed to counter repeated suggestions that he was antisemitic.
But Mr. Bush defended his decision to invade Iraq, referring to his repeated suggestions that Saddam Hussein possessed banned weapons that posed a threat to the United States and other nations.
He also agreed with Mr. Gittins's repeated suggestions that testimony by Commander Waddle and the others could better explain what happened aboard the submarine that day.
There have been repeated suggestions that Gove is still backseat-driving the Conservatives' schools policy, even though he was asked to step aside in the last reshuffle.
One of the repeated suggestions for the pay gap between men and women is that women don't negotiate as well as men.
