undertow

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Related to Undertoe: undertone, rip current

undertow

1. the seaward undercurrent following the breaking of a wave on the beach
2. any strong undercurrent flowing in a different direction from the surface current

undertow

[′ən·dər‚tō]
(oceanography)
A subsurface seaward movement by gravity flow of water carried up on a sloping beach by waves or breakers.