Meaning
To touch a sore spot / To rub salt in the wound
Example
Falar sobre a doença do filho dele é meter o dedo na ferida.
Talking about his son's illness is touching a sore spot.
Origin
The image is biblical: doubting Thomas poking his finger into Jesus's wound (John 20:27).
Source: John 20:27.
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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