# failover

CEFR C1 · Noun

Source: https://englishreference.com/word/failover
Updated: 2026-07-22

## Definition

a backup system that starts working automatically if the main system stops. It helps keep websites or services running without any breaks.

For teachers: a method of protecting computer systems from failure by automatically switching to a standby database, server, or network if the primary one becomes unavailable.

## Examples

- The system has a failover to prevent data loss.
- During the power outage, the automatic failover to the secondary server ensured that the website remained online for all users.
- Engineers implemented a multi-region failover strategy to maintain high availability even in the event of a catastrophic failure at the primary data center.

## Usage notes

- Often used as a modifier before another noun, such as 'failover mechanism' or 'failover site'.

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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.