(noun) a town in central Belgium where in 1815 Napoleon met his final defeat.
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Noun Definition 1
(noun) a final crushing defeat. Synonyms: waterloo. Example: "He met his waterloo."
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Noun Definition 2
(noun) the battle on 18 June 1815 in which Prussian and British forces under Blucher and the Duke of Wellington routed the French forces under Napoleon. Synonyms: Battle of Waterloo.