Groundswell meaning

groundswĕl
A sudden gathering of force, as of public opinion.

A groundswell of antiwar sentiment.

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A broad deep undulation of the ocean, often caused by a distant storm or an earthquake.
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A violent swelling or rolling of the ocean, caused by a distant storm or earthquake.
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A rapidly growing wave of popular sentiment or opinion.
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(nautical) A broad undulation of the open ocean, often as the result of a distant disturbance.
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(by extension) A broadly-based shifting of public opinion.
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Origin of groundswell