Correct
里应外合
/ lǐ yìng wài hé /
Strokes
Definition
to coordinate outside and inside offensives (idiom)/(fig.) to act together
Example
Definition
act from inside/within in coordination with forces attacking from outside/without; collaborate from within with forces from without
1
Zhè
这
qǐ
起
qiǎngjié
抢劫
kěndìng
肯定
shì
是
lǐyìngwàihé
里应外合
。
Someone on the inside must have helped with the robbery.