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backup /ˈbækˌʌp/

Anh-Anh

noun

plural -ups

[count] :a person or thing that can be used to replace or support another person or thing

His role on the team is to be a backup to the regular quarterback.

We have an extra radio as a backup in case this one doesn't work. - often used before another noun

a backup quarterback

We need a backup plan in case of emergency.

[noncount] :help or support provided by additional people or things

The policeman called for backup [=called for other police to come and help him] because the suspect was carrying a gun.

We have an extra radio for backup.

He provides backup for the regular quarterback.

[count] US :a situation in which the flow of something (such as traffic) becomes blocked

There was a traffic backup [=(Brit) tailback] for miles on the road because of the accident.

There was a backup [=blockage] in the drain.

[noncount] :a musical part that is sung to support the main singer

She sang backup on his CD. - often used before another noun

a backup singer

[count] :a copy of information stored on a computer

Be sure to make a backup of your work. - often used before another noun

a backup file/copy also; :the act or process of making such a copy

It may take some time for the backup to be complete. - see also back up at 4back