From Longman Dictionary of Contemporary Englishtwist/turn the knife (in the wound)twist/turn the knife (in the wound)UPSETto say something that makes someone more upset about a subject they are already unhappy about → knife
Examples from the Corpus
twist/turn the knife (in the wound)• Saints twisted the knife with a glorious try from Tony Sullivan, set up by Gary Connolly.• The tragedy is that you have to twist the knife in your own gray matter to make this defense work. 