Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A sudden gathering of force, as of public opinion: a groundswell of antiwar sentiment.
- n. A broad deep undulation of the ocean, often caused by a distant storm or an earthquake.
Century Dictionary and Cyclopedia
- n. An obsolete variant of groundsel.
- n. A broad, deep swell or rolling of the sea, occasioned by a distant storm or heavy gale, and sometimes also by distant seismic disturbances: sometimes used figuratively of a rolling surface of country, and also of a rising wave of sound or of emotion.
Wiktionary
- n. nautical A broad undulation of the open ocean, often as the result of a distant disturbance
- n. by extension A broadly-based shifting of public opinion
GNU Webster's 1913
- n. (Bot.), [Obs.] A broad, deep swell or undulation of the ocean, caused by a long continued gale, and felt even at a remote distance after the gale has ceased.
- n. A long, deep wave in the sea, sometimes caused by distant winds or storms.
- n. A rising sentiment of support or enthusiasm, especially among the general public.
- n. See under Ground.
WordNet 3.0
- n. a broad and deep undulation of the ocean
- n. an obvious change of public opinion or political sentiment that occurs without leadership or overt expression
Etymologies
- ground + swell (Wiktionary)
Examples
“To convey these values, the Obama campaign claims to be taking grass-roots organizing to a new level, harnessing what they describe as a groundswell of enthusiasm.”
“The SACBC also called attention to what it described as a groundswell of discontent building up in the coloured community especially in the Western and Northern Cape.”
“The column is about how there is a so-called groundswell to President Obama's alleged”
“It will meld social software into the larger BI platform capabilities to tap into what Gartner calls a groundswell of interest in informal collaboration.”
“When taking customer feedback, important to double-back to create evangelists called the groundswell that succeeded in reviving the TV show "Jericho"'squeeky wheels' The revival failed.”
“Insiders say that at the council's last meeting on 16 July there was a "groundswell" of support among County FA members for a return to the days when the chair would be appointed from within their own august ranks.”
The Guardian: Football Association shareholders pass on chance of reform
“But apparently the "groundswell" that Bonner promised to generate against clean energy legislation wasn't quite strong enough, so Bonner's staff guy on the project resorted to forgery.”
“But you really have to wonder, when this is the relatively routine stock-in-trade of firms like Bonner, why members of Congress pay any attention -- they may not know that such letters are forged, but they're far too smart not to know how phony the "groundswell" of public opinion they allege to represent is.”
“Anyway, in 2004, a "groundswell" of new voters was also predicted by the Left.”
John Wihbey: Indecisions 2000 and 2004: Final Days Remembered
Lists
These user-created lists contain the word ‘groundswell’.
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Interesting words
A list of words that are odd or words that I have looked up.
concupiscence, brize, scree, scoria, forestaff, spanaemia, valetudinarianism, distasture, pyrethrum, laudanum, gentian, bicameral and 11184 more...
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Waves and Waveforms
wave, brainwave, soliton, traveling wave, tidal wave, transverse wave, capillary wave, cats' paws, alpha wave, light wave, microwave, acoustic wave and 314 more...
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Web Words to Know
Neologisms, portmanteau, and adapted words that pertain to the internet and technology.
blog, collective intell..., crowdsourcing, flash mob, follow friday, google, groundswell, hash tag, lifecasting, lurker, mashup, meme and 15 more...
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Well
well, wells, swells, hot-well, well-being, wellborn, wellaway, wellness, Ida Bell Wells, H.G. Wells, Henry Wells, that's all well a... and 54 more...
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tranquill's Words
loquacious, unmitigated, trundle, ephemeral, vociferous, trapezoidal, liminal, obsequious, veracity, squash, onomatopoeia, oscillate and 267 more...
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Vocab++
Words as I learn them.
fetid, mezzanine, hiatus, austerity, subliminal, resplendent, implacable, impugn, debase, exiguous, cirque, holster and 2538 more...
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Words that I found in old books and ...
blundderbuss, eft, bradawl, scarlatina, sclerotium, ball turret, caddis fly, calomel, cock-and-bull story, codbank, fasces, fava and 13 more...
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The Waves
In the water. See also waves-and-waveforms.
comber, groundswell, wavelet, tidal wave, billow, breaker, seiche, mirobia, rolling wave, surge, swell, bow-wave and 40 more...
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Tremors
Earthquake words.
sussultatory, groundswell, aftershock, brasmatias, earth-tilting, earth-tremor, teleseism, seismogram, microseism, tilt, epicenter, tsunami and 51 more...
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Miscellany, pt. g
gashlycrumb, gravida, ghee, glaucous, groundswell, gruntle, gelid, golden handcuffs, glaikery, glair, gibbet, goldvein and 4 more...
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G is for Guitar Face
My G Words
good grief, gruesome twosome, gal friday, gallop, galoshes, gangbusters, gaslight, gestapo, gigolo, gingersnaps, girdle, girl friday and 67 more...
Tweets
Looking for tweets for groundswell.

fbharjo prelude to an earthburst? Apr 4, 2012
treeseed Merriam-Webster Dictionary:
noun
Date: 1786
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 Jan 30, 2008