Meaning
To dump someone / To reject someone
Example
Ontem na festa a Camila deu um fora no Enzo, foi muito engraçado!
Yesterday at the party Camila rejected Enzo, it was really funny!
Origin
'Fora' = outside / out. 'Dar um fora' = to 'give someone the out' — to reject.
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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