开后门

kāihòumén

open the "backdoor"—give somebody special advantage (or privilege)

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kai1 hou4 men2

to open the back door, fig. under the counter, to do a secret or dishonest deal, to let sth in by the back door

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開後門|开后门 [kāi hòu mén] ► to open the back door ► fig. under the counter ► to do a secret or dishonest deal ► to let sth in by the back door