add insult to injury
add insult to injury {v. phr.}
1. To hurt someone's feelings after doing him harm.
He added insult to injury when he called the man a rat after he had already beaten him up.
2. To make bad trouble worse.
We started on a picnic, and first it rained, then to add insult to injury, the car broke down.
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Source: A Dictionary of American Idioms