Act as someone who does not understand a situation in order to not do something or not face the consequences. An explanation I read is a reference to mutilated

Act as someone who does not understand a situation in order to not do something or not face the consequences. An explanation I read is a reference to mutilated men being dismissed from going to war https://www.dicionariopopular.com/dar-uma-de-joao-sem-braco/ https://www.dicionariopopular.com/dar-uma-de-joao-sem-braco/ ( A Google translator might help)