| 词组 | back up |
| 释义 | back up 1. back up sth • back sth up to prove that something is true: ▪ There was no scientific evidence to back up their claims. ▪ It was fortunate that the videotape backed up the manager's story. ■ SIMILAR TO: support 2. back sb up • back up sb to support someone by saying that they are telling the truth: ▪ Peggy was there too. She'll be able to back me up. ▪ He swears he's telling the truth and has witnesses who will back him up. 3. back up sb/sth • back sb/sth up to provide help or support for someone or something: ▪ Officials discussed the possibility of using military forces to back up the police. ▪ a series of security arrangements which would back up a peace deal ▪ solar power, backed up by a propane generator back-up n singular, U help or support for someone or something: ▪ Several police cars provided back-up for the officers. back-up adj always before noun back-up systems, services, or equipment are designed to be used if the main one does not work effectively: ▪ Nuclear reactors have superbly efficient back-up systems in case of emergencies. 4. back up sth • back sth up to make a copy of information on a computer, and store it on a separate disk or tape so that the information is safe if there is a problem with the computer: ▪ You should back up your data at least once a week. back-up n C a copy of information on a computer: ▪ The tape drive does an automatic back-up every lunchtime. ▪ Remember to keep back-ups of all your important files. back-up adj always before noun used or produced when you make a copy of information on a computer: ▪ back-up disks ▪ a back-up copy 5. back up • back up sth • back sth up if you back up or back a vehicle up, you drive backwards: ▪ Will you back up a bit so that I can get through, please? ▪ The driver backed the taxi up to the hotel door. ■ SIMILAR TO: reverse BrE 6. back up if traffic backs up, it stops moving and forms a long line because there are so many vehicles: ▪ If you leave town after five o'clock the traffic starts backing up really badly. |
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