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An underwater current flowing strongly away from the shore, usually caused by the seaward return of water from waves that have broken against the shore.
(noun)
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A tendency, especially in thought or feeling, contrary to what seems the strongest: "As she talks nostalgically of her days of glory . . . a poignant undertow emerges” ( Tina Brown).
(noun)
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.