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Từ điển Oxford Advanced Learner 8th
back something up
▪ I. ˌback sthˈup derived
(computing)to prepare a second copy of a file, program, etc. that can be used if the main one fails or needs extra support
• It's a good idea to back up your files onto a memory stick.
related noun ↑backup
Main entry: ↑backderived
▪ II. ˌback sb/sthˈup derived
1. to support sb/sth; to say that what sb says, etc. is true
• I'll back you up if they don't believe you.
• The writer doesn't back up his opinions with examples.
2. to provide support for sb/sth
•two doctors backed up by a team of nurses
• The rebels backed up their demands with threats.
related noun ↑backup
Main entry: ↑backderived
▪ III. ˌback ˈup | ˌback sthˈup derived
to move backwards, especially in a vehicle
•You can back up another two feet or so.
•I backed the car up to the door.
Main entry: ↑backderived
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