Meaning
To swear up and down
Example
Ele tinha jurado de pés juntos que não tinha roubado nada.
He swore up and down that he didn't steal anything.
Origin
The expression is traced to the Inquisition. On the Iberian Peninsula, the accused were interrogated under torture with their feet bound together (or hung upside down), and made to swear to the truth of their words in that position.
Source: Gramática.
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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