ground swell

Definitions of ground swell
  1. noun
    a broad and deep undulation of the ocean
    synonyms: heavy swell
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    type of:
    crestless wave, swell
    the undulating movement of the surface of the open sea
  2. noun
    an obvious change of public opinion or political sentiment that occurs without leadership or overt expression
    “there was a ground swell of antiwar sentiment”
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    type of:
    a change from one place or state or subject or stage to another
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