rub salt into the wound
From Longman Dictionary of Contemporary Englishrub salt into the woundrub salt into the woundinformalWORSE to make a bad situation even worse for someone → rubExamples from the Corpusrub salt into the wound• Boro rubbed salt into the wound by scoring with their first genuine scoring attempt.• To rub salt into the wound, they had Michael Mols sent off.