借刀杀人

1.murder a person with a borrowed knife; borrow a knife to kill a man -- to make a third party the instrument of a crime; borrow a knife to kill others; do harm to sb. through the hands of another; find an excuse to get rid of sb.; kill one's rival by proxy; kill sb. by another's hand; make use of another person to get rid of an adversary; use a cat's paw to get rid of sb.; use another's hand to get rid of sb.; use another's knife to kill a person; (try to) use sb.'s name for one's own ends to attack others