Meaning
Resting place / God's acre
Example
Levaram as flores ao campo santo no Dia de Finados.
They took the flowers to the resting place on All Souls' Day.
Origin
Literally 'holy field.' The phrase calques the Italian/Spanish camposanto, itself a Christian-era Latinization (campus sanctus) of the older Greek-derived cemitério (koimetḗrion, 'sleeping-place').
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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