Meaning
Devil's advocate
Example
Virou advogado do Diabo agora? Estamos decepcionados de você defender aquele cara!
Have you become the Devil's advocate now? We're disappointed you defended that guy!
Origin
The phrase traces back to the Catholic canonization process. From the late 16th century a Vatican official called the Promotor Fidei (Promoter of the Faith), popularly nicknamed the advocatus diaboli, was tasked with arguing against a candidate's sainthood so their case could be properly stress-tested. The role was formally established under Sixtus V in 1587 and only reformed in 1983 by John Paul II.
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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