undertide

/ˈʌndərˌtaɪd/
noun
  1. A current of water that flows beneath the surface, often in a different direction from the surface current.
    • Swimmers should be aware of the undertide that can pull them away from shore.
    • The undertide near the reef was strong enough to drag debris out to sea.
    • Fishermen know that the undertide affects where fish gather beneath the waves.
  2. A hidden or underlying trend, influence, or feeling that is not immediately obvious.
    • The novel explores the undertide of resentment beneath the family's peaceful surface.
    • There was an undertide of anxiety in the office before the big announcement.
    • Political undertides can shift public opinion long before an election.
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