借刀杀人 (借刀殺人) jiè dāo shārén

jiè dāo shārén set phrase to lend a knife to kill; to use somebody to do dirty work
Domain: Idiom 成语
Notes: (CC-CEDICT '借刀殺人'; Guoyu '借刀殺人'; Mathews 1931 '借刀殺人', p. 103)