1. backup, accretion, accumulation

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

2. stand-in, substitute, relief, reliever, backup, backup man, fill-in, peer, equal, match, compeer

usage: 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"

3. accompaniment, musical accompaniment, backup, support, part, voice

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

4. backup, computer backup, duplicate, duplication

usage: (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"

5. backing, backup, championship, patronage, blessing, approval, approving

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

WordNet 3.0 Copyright © 2006 by Princeton University.
All rights reserved.

See also: backup (Dictionary)