格杀勿论

格殺勿論
géshāwùlùn
(idiom) to kill on sight (without fear of prosecution)

CEDICT

Use of deadly force authorized; it is permitted to kill (someone) without any legal consequence.

Wiktionary

当场击杀而不以杀人论罪。

重編國語辭典

击杀凶恶的人不以杀人论罪

維基詞典

Entry Composition

1 格杀 géshā
  1. (archaic) to strike dead; to kill (by violence)
  2. to strike dead; to kill (by violence)
2 勿论 wùlùn
  1. (literary) to not prosecute
  2. to not prosecute