⒈ 指通过对方眷属进行某种活动，有贬义。
例他这件事是通过走内线活动成功的。
英go through private channels; take the inner line; seek sb's favour by approaching his family members or confidents;
⒈ 巴结或亲近有权势者的眷属或亲信，进行某种行动。
引《二十年目睹之怪现状·第八八回》：「但恐卑职一个人办不过来，不免还要走内线。」