"meet one’s Waterloo : To be decisively defeated by an encounter with a powerful opponent or a..."

“meet one’s Waterloo : To be decisively defeated by an encounter with a powerful opponent or a problem that is too difficult.
The Battle of Waterloo, which marked the end of the Napoleonic Wars after Napoleon Bonaparte was defeated by armies of Britain and Prussia, took place on this day in 1815.”

- https://en.wiktionary.org/wiki/meet_one%27s_Waterloo#English

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