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From The Collaborative International Dictionary of English v.0.48:
Overfall \O"ver*fall`\, n. 1. A cataract; a waterfall. [Obs.] [1913 Webster] 2. (Naut.) A turbulent surface of water, caused by strong currents setting over submerged ridges; also, a dangerous submerged ridge or shoal. [1913 Webster]