Meaning
To change the subject
Example
Já estou cansada deste tema, vamos trocar o disco, por favor!
I'm tired of this topic, let's change the subject, please!
Origin
Trocar o disco ("to change the record") comes from the age of vinyl: once a record had played through, or you were simply tired of the same song, you swapped it for another. Asking someone to trocar o disco is asking them to drop a worn-out subject and talk about something else.
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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