be in the loop/be out of the loop idiom informal
（不）是消息灵通人士;（不）是圈内人
to have or not have the special knowledge or power that belongs to a particular group of people
You can tell she's in the loop. She always knows about policy decisions before the rest of us. 她很明显是圈内人。她总是在我们所有人之前就知道政策决定。
I've been out of the loop since I changed jobs. I didn't realize Wendy and Bob had got engaged. 我换工作之后一直消息闭塞。我还不知道温迪和鲍勃已经订婚了呢。