She told him to backdoor the building so they wouldn't be seen.

We exited through the backdoor to avoid interrupting the meeting.

The consultant backdoored the server to enable covert access.

The security analyst found clues that the developer had been backdooring the application to grant hidden access.

Security researchers discovered multiple backdoors in the software that allowed remote access.

Networks often use backdoor pilots to test new characters and concepts within established series.

The studio decided to insert a backdoor pilot into the sitcom's season finale to gauge interest in a spin-off.