do somebody yourself an injury 成语
add insult to injury
add another negative, make it worse, put your foot in it If you say his answer is wrong, and then say he can't understand, you've added insult to injury.
add insult to injury|injury|insult
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.
injury
injury see
add insult to injury.