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deve ter se enganado

must have been mistaken

→ dever
phrase Rare #41,923
must have been mistaken Used to make a likely inference about a past mistake. In Brazilian Portuguese, enganarse means “to be mistaken” or “to make a mistake.”
PO: O professor deve ter se enganado com a data.
EN: The teacher must have been mistaken about the date.

Deve ter se enganado.

You must have been mistaken.

— Podres de Ricos (2018)

Tom deve ter se enganado.

Tom must have been mistaken.

Teller deve ter se enganado.

Teller must have made a mistake.

— Oppenheimer (2023)

Você deve ter se enganado.

You must be mistaken.