Definition of overfall

  1. 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. 2 obsolete :  cataract, waterfall

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

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

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