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rip current

A strong water-surface current of short duration flowing seaward from the shore; the return movement of water piled up on the shore by incoming waves and wind. It usually appears as a visible band of agitated water; and, with the outward movement concentrated in a limited band, its velocity is somewhat accentuated. A rip current is often miscalled a ``rip tide. To swimmers, the phenomenon is known as ``undertow.

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