Meaning
Each to his own / Mind your own business
Example
Francisco que é pintor vive dando palpite sobre a instalação elétrica. Cada macaco no seu galho.
Francisco, who is a painter, always gives advice on electrical work. Each to his own.
Origin
The picture is from the treetops: just as each monkey keeps to its own branch, each person should stay in their place and tend only to what concerns them. The phrase cada macaco no seu galho ("each monkey on its own branch") works as a folk proverb, and reference dictionaries class its precise etymology as uncertain.
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