insider

n. /ɪnˈsaɪ.dɚ/ C1

知情人；内部人士

Someone who is an accepted member of an organization or group.

仙境例句

An insider from the kitchen told Alice that the cook had eaten half the tarts herself.

一个厨房里的知情人告诉爱丽丝，厨娘自己就吃掉了一半馅饼。