养虎遗患

养虎遗患	yǎng hǔ yí huàn	Rear a tiger and court disaster. (idiom); fig. if you're too lenient with sb, he will damage you later / to cherish a snake in one's bosom
养	yǎng	to raise (animals) / to bring up (children) / to keep (pets) / to support / to give birth
虎	hǔ	tiger / CL:只
遗	yí	(bound form) to leave behind
患	huàn	to suffer (from illness) / to contract (a disease) / misfortune / trouble / danger / worry