[noun] an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet"
[noun] someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins" Synonyms:stand-in, substitute, relief, reliever, man, fill-in
[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" Synonyms:computer
[noun] the act of providing approval and support; "his vigorous backing of the conservatives got him in trouble with progressives" Synonyms:backing, championship, patronage
