假途灭虢

jiǎ tú miè guó

lit. a short-cut to crush Guo (idiom); fig. to connive with sb to damage a third party, then turn on the partner

假

jiǎ

variant of 假[jia3]

途

tú

way

灭

miè

to extinguish or put out

虢

guó

surname Guo