krvnik

1. butcher; tormentor; murderer
   Narod nikada nije zaboravio svoje krvnike. — The people never forgot their tormentors.
2. (in sports) nemesis; bane
   Stari krvnik Zvezde ponovo je dao gol. — Zvezda's old nemesis scored again.
3. dated executioner; hangman
   Krvnik je čekao osuđenika na trgu. — The executioner was waiting for the condemned man in the square.

Usually used with the genitive of the victim: krvnik naroda, krvnik Partizana.