twist the knife (in the wound)
US /twɪst ðə naɪf ɪn ðə wuːnd/
UK /twɪst ðə naɪf ɪn ðə wuːnd/

1.
雪上加霜, 在伤口上撒盐
to make a bad situation even worse for someone, especially by reminding them of their failures or weaknesses
:
•
After he lost the game, his opponent decided to twist the knife by mocking his performance.
在他输掉比赛后,他的对手决定嘲笑他的表现,雪上加霜。
•
She already felt terrible about her mistake, so his sarcastic comment just twisted the knife.
她已经对自己的错误感到非常糟糕了,所以他那讽刺的评论只是雪上加霜。