开后门

A key phrase in modern Chinese discourse on 关系 (personal connections) and corruption. 开后门 (literally 'open the back door') means using influence to bypass official procedure - getting a job, a school spot, a hospital bed, or a permit through informal channels.

grammar

Verb-object phrase. The object 后门 can be modified: 给他开后门 (open the back door for him), 走后门 ('walk through the back door' - same meaning, slightly more passive).