To kick the bucket / to bite the dust
O bicho de estimação bateu a caçuleta de velhice.
The pet kicked the bucket from old age.
Caçoleta (the standard form) entered Portuguese via French cassolette and originally named the small priming pan of an antique flintlock — the part struck by the cock to fire the shot.
Source: Ciberdúvidas — Bater a caçoleta.
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