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Napoloeon Bonaparte was defeated by the English at the town of Waterloo. When you say that someone has "met their Waterloo," you mean they have unexpectedly met defeat. Napoleon was certain that he was going to win, and would be the ruler of the known world - usually the people described by this idiom are people with grand dreams or lots of power.

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Q: What does 'Waterloo' mean as a slang or idiomatic expression?
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