Topic
undertow.
subsurface flow of water returning seaward from shore as result of wave action; average under-current which is moving offshore when waves are approaching a shore
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About undertow
In physical oceanography, undertow is the undercurrent that moves offshore while waves approach the shore. Undertow is a natural and universal feature for almost any large body of water; it is a return flow compensating for the onshore-directed average transport of water by the waves in the zone above the wave troughs. The undertow's flow velocities are generally strongest in the surf zone, where the water is shallow and the waves are high because of shoaling.
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