the world > the earth > water > flow or flowing > wave > movement of waves > [noun] > overfall (3)
Frequently in plural. A turbulent stretch of sea or water with short breaking waves, caused by a strong current or tide flowing over a submarine…
A disturbed state of the sea with short breaking waves, caused by a strong current or tide flowing over an underwater ridge or shoal, or by the…
a stretch of fast-flowing and rough water in the sea or in a river; spec. = rip current n.; also figurative.