back up

/bˈak ˈʌp/

/bˈæk ˈʌp/

to back up

MAIN VERB

[phrase form: back]

to support someone or something

synonyms : support

move backwards from a certain position

synonyms : back down

establish as valid or genuine

synonyms : back

become or cause to become obstructed

synonyms : choke

antonyms : unclog

to make a copy of computer data

*** Move a vehicle backward

*** Undo one’s actions

*** Reconsider one’s thoughts

Examples

1. And tests backed up these claims.

2. Brain imaging studies have also backed up these findings.

3. About halfway down, the traffic backed up.

4. Backing up the files.