turn the knife

Related to turn the knife: twist the knife

turn the knife

To add to, exacerbate, or amplify a betrayal or wrong by further malicious actions. He said it was over, and then he turned the knife and said he had never loved me.
See also: knife, turn
Farlex Dictionary of Idioms.

turn/twist the ˈknife (in the wound)

deliberately remind somebody of something they are already upset about, and so upset them even more: After the divorce, her friend turned the knife in the wound by saying she had always thought that the marriage wouldn’t last. All right. I know I was stupid. You don’t have to twist the knife.
See also: knife, turn, twist
Farlex Partner Idioms Dictionary
See also:
  • turn/twist the knife
  • twist the knife
  • keep your friends close and your enemies closer
  • stirring
  • sup with the devil
  • dine with the devil
  • do more harm than good
  • insult
  • add insult to injury
References in periodicals archive
But ex-car salesman Svensson took command from then on, scoring in the 67th minute with a cross-shot and squaring the ball for Bradbury to turn the knife in the wound after 86 minutes.
Yesterday another student said in a statement that Cornick had threatened to "turn the knife" on his friends if they told of his plan.