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overfall

noun

Definition of overfall 

1 : a turbulent surface of water caused by strong currents setting over submerged ridges or shoals or by winds opposing a current —usually used in plural

2 obsolete : cataract, waterfall

3 : a place provided for the overflow of surplus water (as from a canal or lock)

4 : a sudden increase of depth in the bottom of the sea or other large body of water

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