Meaning
To nag / To be on someone's case
Example
Minha mãe não para de pegar no meu pé para eu arrumar o quarto.
My mom won't stop nagging me to clean my room.
Origin
Nagging someone 'on the foot' — like a small dog grabbing an ankle and refusing to let go.
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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