IdiomAnimalsItalian

qui casca l'asino

Meaning: That is the crux of the matter; that is where the real difficulty lies.

Literally: Here the donkey falls

Example: “Nessuno controlla le fatture: qui casca l'asino.” — Nobody checks the invoices; that's the heart of the matter.

English equivalent: The heart of the matter

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Origin: "This is where the donkey falls": the exact point where someone gets caught out. The Hoepli dictionary links it to the so-called ponte dell'asino (donkey's bridge), the bridge donkeys risk falling off. That is the Latin pons asinorum, the nickname for the fifth proposition of Euclid's geometry, a famous stumbling block that separated able students from the rest.

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