ㄌㄧˇㄍㄡgōuㄨㄞˋwàiㄌㄧㄢˊlián

  1. 內外勾結連成一氣水滸傳·》:如今裡勾外連北京。」裡應外合」、外合裡應」。

to act from inside in coordination with attackers outside, attacked from both inside and out