Meaning
To hit on someone / To flirt
Example
Depois que a nova vizinha chegou, ele vive arrastando as asas para ela.
After the new neighbor arrived, he keeps hitting on her.
Origin
The 'asas' are a bird's wings — flirting is compared to a bird trailing a wing in a courtship display.
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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 troubleAbrir 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 opportunityBater as botasTo kick the bucket / To die