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a ideia foi minha

it was my idea

→ a
phrase Rare #41,626
it was my idea Used to claim credit for an idea. The adjective possessive minha agrees with ideia, which is feminine.
PO: Não foi ideia dele; a ideia foi minha.
EN: It wasn't his idea; it was mine.

Mas a ideia foi minha.

But it was my idea.

— Os Caras Malvados (2022)

A ideia foi minha!

The idea was mine!

— Marty Supreme (2025)

Minha, Condessa, a ideia foi minha.

My dear Countess, the idea was mine.

— A Voz do Coração (2004)

A ideia foi minha.

The idea was mine.

— Avatar: O Caminho da Água (2022)