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noun ground·swell \ˈgrau̇nd-ˌswel\

Simple Definition of groundswell

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

Source: Merriam-Webster's Learner's Dictionary

Full Definition of groundswell

  1. 1 usually ground swell :  a broad deep undulation of the ocean caused by an often distant gale or seismic disturbance

  2. 2 :  a rapid spontaneous growth (as of political opinion) <a groundswell of support>

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