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 expression evokes a card-game image: revealing your hand instead of bluffing. This is a useful comparison for abrir o jogo ("to open the game"), rather than a documented account of its historical origin.
Source: Michaelis.
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