undercurrent

(-kʉr′ənt)

noun

  1. a current, as of water or air, flowing below another or beneath the surface
  2. an underlying tendency, opinion, etc., usually one that is kept hidden and not expressed openly

See undercurrent in American Heritage Dictionary 4

noun
  1. A current, as of air or water, below another current or beneath a surface.
  2. An underlying tendency, force, or influence often contrary to what is superficially evident; an intimation: “The Gaucho began to talk, calmly but with an undercurrent of passion” (Thomas Pynchon).

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