Meaning
Sort it out yourself / figure it out on your own
Example
Perdeu a chave? Rebole no mato, não vou te ajudar.
Lost the key? Sort it out yourself, I'm not helping you.
Origin
A Northeastern phrase, originally literal: rebolar no mato meant to throw something useless out into the bush — the rural-house equivalent of taking out the trash.
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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