- an accumulation caused by clogging or a stoppage
- someone who takes the place of another (as when things get dangerous or difficult)
- a musical part (vocal or instrumental) that supports or provides background for other musical parts
- (computer science) a copy of a file or directory on a separate storage device
💬 Examples
- "a traffic backup on the main street"
- "he discovered a backup in the toilet"
- "the star had a stand-in for dangerous scenes"
- "we need extra employees for summer fill-ins"