Meaning
Move on / Keep going forward
Example
Amiga, você precisa superar o seu ex-namorado, bola pra frente!
Girl, you need to get over your ex-boyfriend, move on!
Origin
Bola pra frente ("ball forward") comes from football: when a team is losing or under pressure, the cry is to send the ball forward toward the opponents and keep the play going rather than dwell on what went wrong.
Source: Aprendendo Português Brasileiro.
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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