Wiktionary
rub salt in the wound
vb. (context idiomatic English) To make an injury, physical or emotional, feel worse.
Usage examples of "rub salt in the wound".
And too tender a pride, as well, to let them rub salt in the wound of being the tavern wench's bastard.
And too tender a pride, as well, to let them rub salt in the wound of being the tavern wench’.