|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|
"he made a backup in case the original was accidentally damaged or erased"
|Related terms:||duplicate computer_science|