noun
A flow of water over the edge of a cliff.
(figuratively) A waterfall-like outpouring of liquid, smoke, etc.
(software engineering) Short for waterfall model
(slang, US) The action of drinking from a vessel without touching it with the lips, considered more sanitary for a shared vessel.
(colloquial, dated) A necktie.
(colloquial, dated) A chignon (hairstyle).
(colloquial, dated) A beard.
(gymnastics) A kind of handstand with chin tucked and back arched.
verb
(intransitive) To fall like a waterfall.
(transitive) To drink (something) from a container by pouring it from a height so as not to touch one's lips to the rim.
(roller derby) Synonym of recycle.