stick the knife in the wound

Translations
воткнуть нож в рану
Every time she mentioned his failure, it felt like she was sticking the knife in the wound.
Каждый раз, когда она упоминала о его неудаче, это было как воткнуть нож в рану.
Definitions
To make a bad situation even worse for someone, often by saying or doing something that increases their pain or distress, especially when they are already suffering.