back door

Noun

a secret or underhand means of access (to a place or a position);

"he got his job through the back door"

an undocumented way to get access to a computer system or the data it contains

an entrance at the rear of a building

back door例句

用作名词(n.)

Does the back door have a lock on it?
后门有锁吗？

We slip out of the postern door of the castle.
我们从城堡的后门溜出。

back door近义词

backdoor