Meaning
To ace something / To do with ease
Example
Conhecendo bem o talento dela, sei que está tirando de letra a prova de japonês.
Knowing her talent well, I know she is acing the Japanese test.
Origin
The expression tirar de letra is usually traced to football. A move done de letra is played by swinging one leg behind the supporting foot to strike the ball, an elegant flourish that turns a simple play into something stylish.
Source: Priberam.
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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