虢—

假道伐虢—

borrow the resources of an ally to attack a common enemy [idiom.]

obtain safe passage to conquer the State of Guo

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

如果我们借路给晋国，那么虢国早晨灭亡，虞国晚上也就会跟着灭亡。

chinesestoryonline.com

If Your Majesty lends

[...] road to Jin, the most possible result will be Guo is conquered at dawnand Yufallat dusk.

chinesestoryonline.com

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