Undercurrent definition is - a current below the upper currents or surface.
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A current, as of air or water, below another current or beneath a surface. An underlying tendency, force, or influence often contrary to what is superficially evident.
Undercurrent | Definition of Undercurrent at Dictionary.com
A tendency underlying or at variance with the obvious or superficial significance of words, actions, etc. Even in his friendliest remarks, one could sense an undercurrent of hostility. A current, as of air or water, that flows below the upper currents or surface.