Meaning
To slack off / To drag one's feet
Example
O pedreiro está fazendo corpo mole, a obra deveria estar pronta há semanas.
The builder is slacking off, the construction should have been done weeks ago.
Origin
A 'corpo mole' is a limp, soft body — one not putting in effort.
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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