The word 'groundswell' is correct and usable in written English.
It can be used to reference a sudden and widespread increase in support for something. For example, "There has been a groundswell of support for the new mayor's policies."
In a speech in Brussels on Tuesday, the SNP leader spoke of a "groundswell of anger" and a "strong backlash" if Scotland were to be taken out of the EU by a UK-wide referendum.
"Bluntly, I believe that the groundswell of anger amongst many ordinary people in Scotland under these circumstances could produce a clamour for another independence referendum that may well be unstoppable.
Despite widespread cynicism about Rio's ability to deliver anything of substance, there is an energetic groundswell of activity among activists, practitioners, NGOs and academics who want Rio+20 to deliver a workable agreement that puts sustainable development and poverty reduction at the heart of global politics.
Brian Evans of Amnesty, which led the campaign to spare Davis's life, said that there was a groundswell in America of people "who are tired of a justice system that is inhumane and inflexible and allows executions where there is clear doubts about guilt".
"The groundswell of discontent was bound to overwhelm the Jonathan group sooner or later.
The police alone cannot re-establish order, says Yvon Neptune, the prime minister.Mr Aristide also seems to have underestimated the groundswell of anti-government feeling.
"I do feel after we win Ohio for Kerry that we're going to have that groundswell again".Gov.Gov
Luis Tonelli, a columnist for Debate magazine, calls it a "clamour operation", intended to prompt a groundswell of public demand for her candidacy.
Ms O'Donnell's primary win and subsequent defeat is a manifestation of the same groundswell of conservative enthusiasm without which the GOP would not now be sitting so pretty.
He now promises to create a "groundswell of support" for divorce among shareholders.
Although the main parties, the Liberals and the Conservatives, play up corruption claims to gain political advantage, their outrage rarely provokes a public groundswell in favour of speedy action or change.
