swash

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swash

1. a sandbar washed by the waves
2. a channel of moving water cutting through or running behind a sandbank

swash

[swäsh]
(geology)
A narrow channel or ground within a sand bank, or between a sand bank and the shore.
A bar over which the sea washes.
(oceanography)
The rush of water up onto the beach following the breaking of a wave. Also known as run-up; uprush.