Definition of overfalls:
(n) :
A turbulent section of a body of water, caused by strong currents passing over submerged ridges.
(v) :
(intransitive) To fall over; to spill from an edge or height.
(v) :
(intransitive) To fall over; to topple.
(v) :
(transitive) To fall on or spill over so as to cover (something).
(v) :
(transitive) To change or affect so as to pervade (something); to come over
(n) :
Part of a garment that hangs so as to cover a lower part.