Definitions
1.NounA flow of water over the edge of a cliff.
2.NounA waterfall-like outpouring of liquid, smoke, etc."A waterfall of mist came from the open freezer."
3.NounShort for waterfall model"A very long duration project […] had taken a whole group of people through a painful waterfall development process."
4.NounThe action of drinking from a vessel without touching it with the lips, considered more sanitary for a shared vessel."Hey man, can I take a waterfall from your bottle?"
5.NounA necktie.
6.NounA chignon (hairstyle).
7.NounA beard.
8.NounA kind of handstand with chin tucked and back arched.
9.VerbTo fall like a waterfall.
10.VerbTo drink (something) from a container by pouring it from a height so as not to touch one's lips to the rim.
11.VerbSynonym of recycle.