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; an intimation: "The Gaucho began to talk, calmly but with an undercurrent of passion” ( Thomas Pynchon).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.