Meaning
Listen closely / pay close attention
Example
Vigia bem o que eu vou te dizer agora.
Listen closely to what I'm about to tell you.
Origin
A Northern Brazilian imperative: vigia = 'watch out, pay attention.' The compound vigia bem is regional emphasis ('watch well'), used to demand the listener's full attention before saying something important.
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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