Meaning
To show up / To show one's face
Example
Faz tempo que ele não dá as caras por aqui, será que mudou de cidade?
He hasn't shown his face around here in a while, did he move to another city?
Origin
'Dar as caras' = literally 'to give the faces,' i.e., to present oneself in person.
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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