Meaning
To leave, to hit the road.
Example
Já tá muito tarde, vou pegar o beco.
It's already very late, I'm going to hit the road.
Origin
A common expression in the North and Northeast, referring to ducking into an alley (beco, a narrow street) to leave quickly or slip away unnoticed.
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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