Meaning
To cost an arm and a leg
Example
Eu adoraria comprar uma Ferrari, mas elas custam os olhos da cara.
I'd love to buy a Ferrari, but they cost an arm and a leg.
Origin
The popular story credits the Spanish conquistador Diego de Almagro, who lost an eye storming an Inca fortress in the 16th century. Back in Spain, he is said to have told Emperor Charles I that defending the Crown had "cost him an eye from his face" — and so the eyes, among the body's most precious things, became the measure of a ruinous price.
Source: O Povo.
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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