单词 | back up |
释义 | Word Frequency back upverb (adverb) 1. (transitive) to support or assist 2. (intransitive) cricket (of a nonstriking batsman) to move down the wicket in readiness for a run as a ball is bowled 3. (of water) to accumulate 4. (of traffic) to become jammed behind an accident or other obstruction 5. computing to make a copy of (a data file), esp for storage in another place as a security copy 6. printing to print the second side of (a sheet) 7. (intr,; usually foll by on) Australian to repeat an action immediately noun backup 8. a support or reinforcement 9. a. a reserve or substitute b. (as modifier) backup troops 10. US and Canadian a. musical accompaniment, esp for a pop singer b. (as modifier) backup singer 11. the overflow from a blocked drain or pipe 12. computing a file or set of files copied for security purposes |
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