backup

[bak-uhp]

noun

adjective

(of a person, plan, device, etc.) held in reserve as a substitute if needed: a backup driver; a backup generator.
performing a secondary or supporting function: A drummer and guitarist are the singer's backup musicians.

Origin of backup

1775–85, Americanism; noun use of verb phrase back up
Can be confusedback up backup

Usage note

See login.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for backup

Contemporary Examples of backup

Historical Examples of backup



Word Origin and History for backup

see back up.

Online Etymology Dictionary, © 2010 Douglas Harper