salt in the/(one's) wound(s)
An aggravation that makes something unpleasant, difficult, or painful even worse. I can't believe Sally broke up with John the day after his team lost the championship match. Talk about salt in the wounds! My pride was already hurting when I didn't get the job, but it was like salt in my wound to hear that they gave it to Dave instead.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.