Meaning
Six of one, half a dozen of the other
Example
Maria trocou seis por meia dúzia, largou um namorado ruim e arrumou outro péssimo.
Maria swapped six for half a dozen — she left a bad boyfriend and got another terrible one.
Origin
'Trocar seis por meia dúzia' = to swap six for half a dozen. The expression contrasts two mathematically identical quantities and is attested in Portuguese from the 19th century.
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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