[ bak-uhp ]
/ ˈbækˌʌp /



(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 confused

back up backup

Usage note

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

Examples from the Web for backup