1. [ noun ] someone who takes the place of another (as when things get dangerous or difficult)
Synonyms: relief fill-in backup_man substitute reliever stand-in

"the star had a stand-in for dangerous scenes" "we need extra employees for summer fill-ins"

Related terms: peer surrogate locum_tenens double substitute
2. [ noun ] the act of providing approval and support
Synonyms: patronage backing championship

"his vigorous backing of the conservatives got him in trouble with progressives"

Related terms: blessing support back
3. [ noun ] (music,fine art) a subordinate musical part; provides background for more important parts
Synonyms: support accompaniment musical_accompaniment
Related terms: part descant vamp support
4. [ noun ] an accumulation caused by clogging or a stoppage

"a traffic backup on the main street" "he discovered a backup in the toilet"

Related terms: accretion clog
5. [ noun ] (computer science) a copy of a file or directory on a separate storage device
Synonyms: computer_backup

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

Related terms: duplicate computer_science
Similar spelling:   back_up