Meaning
A masterstroke
Example
Convencê-los de que suas ações eram aceitáveis foi um golpe de mestre.
Convincing them that his actions were acceptable was a masterstroke.
Origin
Just 'a great move,' usually taken from chess or fencing — a masterstroke. The phrase is attested in Portuguese since at least the 18th century and has no single documented origin beyond its metaphorical use.
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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 flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity