里应外合

Working in collusion , one from within and the other from without , they created pandemonium.

他们里应外合, 把时局搞得乌烟瘴气.

——《现代汉英综合大词典》

Our troops collaborated with troops inside the town to take the city.

我军与城里的部队里应外合攻下了这座城市.

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