E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Moscow.
So called from the river Moscowa, on which it is built.
1
The monarch of Moscow. A large bell weighing 193 tons, 21 feet high, and 21 feet in diameter.
2
[So-and-So] was my Moscow. The turning-point of my good fortune, leading to future shoals and misery. The reference is to Napoleons disastrous expedition, when his star hastened to its setting.