thalweg
n.— «Then, former president, Saddam Hussein, disputed the Algiers Accord, which ruled the maritime border between the two countries ran along the median line of the deep-water channel, also known as the thalweg.» —“AM: Diplomatic scandal as Iran intercepts British naval vessels” by Kirsten Aiken Austral. Broadcasting Corp. (Ultimo, New South Wales) June 22, 2004. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Responding to someone during a dispute with What does that have to do with the price of tea in China? is a way to deflect the comment or derail the discussion entirely. While the phrase the price of tea in China is the most common version...