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ground-swell (n.)
[ground-swell 词源字典]
also
groundswell
, "broad, deep swell of the sea," 1783, from
ground
(n.) +
swell
(n.). Figurative sense (of sound, emotion, etc.) is attested from 1817.
[ground-swell etymology, ground-swell origin, 英语词源]
[ground-swell 词源字典]