1. A turbulent section of a body of water, caused by strong currents passing over submerged ridges.
2. to fall over (something).
3. to attack (someone).
4. to fall over.

1. A cataract; a waterfall.
2. A turbulent surface of water, caused by strong currents setting over submerged ridges; also, a dangerous submerged ridge or shoal.

1. A cataract; the fall of a river; a rapid.
2. nautical: A dangerous bank or shoal lying near the surface of the sea.
3. A rippling or race in the sea, where, by the peculiarities of the bottom, the water is propelled with great force, especially when the wind and tide or current set strongly together.
4. overshot, as a water-wheel.
5. to fall over: as, a fog overfell them.
6. to fall upon; to attack.
7. to fall; fall over.
8. nautical:
9. A sudden drop in the sea-bottom, as at the edge of a submarine terrace or ledge.
10. that portion of a dam or weir over which the water falls or flows, including the crest and the down-stream face of the dam.