# blue-green deployment

CEFR C1 · Compound

Source: https://englishreference.com/word/blue-green-deployment
Updated: 2026-07-22

## Definition

a way of updating software where you have two identical environments, one live and one idle. You send users to the new version only when it is ready, which makes updates safer.

For teachers: a software release strategy that utilizes two identical production environments, only one of which serves live traffic at any given time. This methodology minimizes downtime and risk by allowing the idle environment to be fully tested before traffic is rerouted to it.

## Examples

- The team used a blue-green deployment to update the app without any downtime.
- By using a blue-green deployment, the engineers were able to roll back the update instantly when they noticed a bug in the new version.
- Implementing a blue-green deployment requires robust automation and database synchronization, but it provides a critical safety net by ensuring that a known-good environment is always available for immediate failover.

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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.