/un"deuhr kerr'euhnt, -kur'-/ , n.
1. 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.
2. a current, as of air or water, that flows below the upper currents or surface.
[ 1675-85; UNDER- + CURRENT ]