přilít oleje do ohně, udělat to ještě horší
First of all he arrived an hour late and then, to add insult to injury, he proceeded to complain about my choice of restaurant. (CIDI)
If you say his answer is wrong, and then say he can't understand, you've added insult to injury. (W.Magnuson, Eng.Idioms)
They told me I was too old for the job, and then to add insult to injury, they refused to pay my expenses!(CALD)
» HEALTH