通内线

通内线

Literally means:

connect the internal circuit

Actually means:

establish underhand connections inside an institution for the sake of personal gain

内线 refers to connection channel, affiliation or human relations inside an institution.

The phrase figuratively means looking for or finding a person in an institution that can help one to accomplish something.

It often indicates that such an act is not conducted aboveboard. Derogatory.

内线，某个机构内部的联系渠道或人事关系。

通内线，比喻为了能办成事情而在某个机构内部寻找可以帮忙的人。

多指不能光明正大地做。具有贬义色彩。