üstüne üstlük yapmak

listen to the pronunciation of üstüne üstlük yapmak
Türkçe - İngilizce
(Konuşma Dili) add insult to injury
To further a loss with mockery or indignity

As if the hostile takeover weren't enough, to add insult to injury they scrapped ninety percent of our products and replaced them with their own.

hit someone when he is already down, hurt someone even more than he is already hurt