Definition of groundswell noun from the Oxford Advanced American Dictionary

 

groundswell

 noun
noun
NAmE//ˈɡraʊndswɛl//
 
[singular]groundswell (of something)(formal)
 
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the sudden increase of a particular feeling among a group of people a groundswell of support There was a groundswell of opinion that he should resign.
See the Oxford Advanced Learner's Dictionary entry: groundswell