Dictionary

groundswell

noun ground·swell \ˈgrand-ˌswel\

: a fast increase in the amount of public support for something (such as a political cause or candidate)

Full Definition of GROUNDSWELL

1
usually ground swell :  a broad deep undulation of the ocean caused by an often distant gale or seismic disturbance
2
:  a rapid spontaneous growth (as of political opinion) <a groundswell of support>

First Known Use of GROUNDSWELL

1786

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