Meaning
To get involved in something complicated or messy.
Example
Ele acabou caindo no tacacá quando decidiu se envolver nas negociações da empresa.
He ended up getting involved in something messy when he decided to participate in the company's negotiations.
Origin
The idiom 'cair no tacacá' originates from the Amazon region of Brazil. Tacacá is a traditional soup made with tucupi (a yellow sauce extracted from wild manioc root), jambu (a native herb that causes a tingling sensation), and shrimp.
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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