1. back door, backdoor, access, access code

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

2. back door, backdoor, back entrance, exterior door, outside door

usage: an entrance at the rear of a building

3. back door, backdoor, access

usage: a secret or underhand means of access (to a place or a position); "he got his job through the back door"

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See also: backdoor (Dictionary)