Waterfall (permanent flow of water over the edge of a cliff).(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "foss" in a sentence
"There Jane's parents lay, not in a grave to themselves, but buried amidst the nameless dead, in that part of the ground reserved for those who can purchase no more than a portion in the foss which is filled when its occupants reach statutable distance from the surface."
"Interestingly (to me) many of the waterfalls in northern England also have names that include the word "foss" due to Norse placenames."
"So what is all the foss about Iran becoming a Nuclear power?"