an accumulation caused by clogging or a stoppage; a traffic backup on the main street; he discovered a backup in the toilet'

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

[ Syn: stand-in , substitute , relief , reliever , backup man , fill-in ]

a musical part (vocal or instrumental) that supports or provides background for other musical parts

[ Syn: accompaniment , musical accompaniment , support ]

(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

[ Syn: computer backup ]

the act of providing approval and support; his vigorous backing of the conservatives got him in trouble with progressives

[ Syn: backing , championship , patronage ]