ground swell is a noun meaning "an obvious change of public opinion or political sentiment that occurs without leadership or overt expression". It carries 2 recorded senses.
an obvious change of public opinion or political sentiment that occurs without leadership or overt expression
“there was a ground swell of antiwar sentiment”
a broad and deep undulation of the ocean
Definitions, synonyms and semantic relations for ground swell come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.