(noun, adjective)


1. Standby, reserve or extra.

- I am only a backup player.

2. (computing) That is intended as a backup.

- Make a backup copy of that file.


1. an accumulation caused by clogging or a stoppage

- a traffic backup on the main street

- he discovered a backup in the toilet

Definition categories: process, accretion, accumulation

2. someone who takes the place of another (as when things get dangerous or difficult)

Similar word(s): relief, reliever, substitute

Definition categories: person, compeer, equal, match, peer

3. a musical part (vocal or instrumental) that supports or provides background for other musical parts

Similar word(s): accompaniment, support

Definition categories: communication, part, voice

4. (computer science) a copy of a file or directory on a separate storage device

- he made a backup in case the original was accidentally damaged or erased

Definition categories: man–made, duplicate, duplication

5. the act of providing approval and support

Similar word(s): backing, championship, patronage

Definition categories: act, approval, approving, blessing

Sentences with backup as a noun:

- If the goalkeeper is injured, we have a backup.

- After the power failure, we had to restore the database from backup.

- The blockage caused a backup in the plumbing.

- He's got a gun - you better send for backup.