Definition of groundswell noun from the Oxford Advanced Learner's Dictionary

 

groundswell

 noun
noun
BrE BrE//ˈɡraʊndswel//
 
; NAmE NAmE//ˈɡraʊndswel//
 
 
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[singular] groundswell (of something) (formal) 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 American Dictionary entry: groundswell