Meaning
To come clean / To open up
Example
Finalmente, ele abriu o jogo sobre o que realmente aconteceu naquela noite.
Finally, he opened up about what really happened that night.
Origin
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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More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunityBater as botasTo kick the bucket / To die