The Pont Neuf is the oldest standing bridge across the Seine in Paris, France. Frasier uses 'water under the pont-neuf' as a highbrow variation of 'water under the bridge.'
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Season 1 · Episode 22 · S01E22
“Oh, it's all water under the pont-neuf.”
From the same episode and category.
“Frasier: Dumas frere. Niles: Dumas frere.”
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