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English definition of “undertow”

undertow

noun [C usually singular] uk   /ˈʌn.də.təʊ/ us    /-dɚ.toʊ/
a strong current flowing underwater in a different direction to the way the water on the surface is moving, especially one that flows away from the land at the same time as a wave hits the beachFloods, tides and currents
(Definition of undertow from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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