A flow of water over the edge of a cliff.
A waterfall-like outpouring of liquid, smoke, etc.
Waterfall model
The action of drinking from a vessel without touching it with the lips, considered more sanitary for a shared vessel.
A necktie.
A chignon.
A beard.
To fall like a waterfall.
To drink (something) from a container by pouring it from a height so as not to touch one's lips to the rim.