形容词

名词

1. （物资、人员等的）支持，辅助
Backup consists of extra equipment, resources, or people that you can get help or support from if necessary.

2. 备用品；后备计划
If you have something such as a second piece of equipment or set of plans as backup, you have arranged for them to be available for use in case the first one does not work.

1. the act of providing approval and support

e.g. his vigorous backing of the conservatives got him in trouble with progressives

Synonym: backingchampionshippatronage

2. (computer science) a copy of a file or directory on a separate storage device

e.g. he made a backup in case the original was accidentally damaged or erased

Synonym: computer backup

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

Synonym: accompanimentmusical accompanimentsupport

4. someone who takes the place of another (as when things get dangerous or difficult)

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

Synonym: stand-insubstitutereliefrelieverbackup manfill-in

5. an accumulation caused by clogging or a stoppage

e.g. a traffic backup on the main street
he discovered a backup in the toilet