to come clean, to open up
Finalmente, ele abriu o jogo sobre o que realmente aconteceu naquela noite.
Finally, he opened up about what really happened that night.
The phrase comes from card games. To abrir o jogo ("to open the game") is literally to lay your cards face up on the table — as in poker or truco — dropping the bluff and showing exactly what you hold.
Source: Escreva.ai.
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