- a turbulent stretch of water caused by marine currents over an underwater ridge
- a mechanism that allows excess water to escape from a dam or lock
- the point at which a sewer or land drainage discharges into the sea or a river
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for overfall
I think there is not in the world so strange an overfall, nor so wonderful to behold.
It was most probable that an overfall existed somewhere, and doubtless through a cleft in the granite.