裡ㄌㄧˇlǐ勾ㄍㄡgōu外ㄨㄞˋwài連ㄌㄧㄢˊlián

內外勾結，連成一氣。《水滸傳·第六二回》：「如今到來，裡勾外連，要打北京。」也作「裡應外合」、「外合裡應」。

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