# backdoor

/ˈbækˌdɔɹ/ (US) · /bˈækdɔː/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/backdoor
Updated: 2026-05-11

## Definition

a secret or hidden way to enter a building or a computer system. It can also mean a way to achieve something by avoiding the usual rules.

For teachers: a secondary entrance at the rear of a building, or a hidden method for bypassing normal authentication in a computer system. Often used metaphorically to describe achieving an objective through indirect or unofficial channels.

## Examples

- The delivery driver used the backdoor to enter the kitchen.
- Hackers exploited a backdoor in the software to access sensitive customer data without being detected.
- While the official policy prohibited such hires, the manager found a backdoor through a temporary consulting contract to bring the specialist onto the team immediately.

## Usage notes

- Often used as a compound noun or as an attributive noun in phrases like 'backdoor deal' or 'backdoor entry'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.