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fail over

C1 neutral inseparable intransitive

In computing and networking, to automatically switch to a backup system, server, or process when the primary one fails.

In plain English

When a computer system breaks down, it automatically switches to a spare system so things keep working.

What does "fail over" mean?

One main meaning — here's how to use it.

1 C1 neutral

For a computer system or network to automatically transfer control to a backup system when the primary system becomes unavailable.

"If the primary server goes down, the system will automatically fail over to the backup in under thirty seconds."

inseparable
Usage tip

A technical IT and networking term. The noun 'failover' (written as one word) is also very common. Not used outside of computing and systems administration contexts.

Words that pair with "fail over"

Natural word combinations native speakers use most often.

server system network database node cluster

How to conjugate "fail over"

The five tense forms you'll use most often.

Base
fail over
I/you/we/they
3rd person
fails over
he/she/it
Past simple
failed over
yesterday
Past participle
failed over
have + pp
-ing form
failing over
continuous

Hear "fail over" in the wild

Listen to native speakers using "fail over" in real YouTube videos — click a clip to watch it on Looplines.

Keep exploring

Jump to every phrasal verb built on the same verb, particle, or level.