meet one's Waterloo

They had to answer one more question: What is the origin of the phrase, "to meet one's Waterloo" and what does it mean?

There was a clear, bright gleam in Ethan's eye as he concluded his answer with, "....to meet one's Waterloo means to suffer a crushing defeat."

In London, a railroad station was named for the battlefield, and the phrase “to meet one’s Waterloo” has entered the English-language lexicon as denoting a particularly cruel defeat.