| 单词 | back up |
| 释义 | back up back (sth) up — phrasal verb with back /bæk/ verb ► F0 to drive backwardsThesaurus+: ↑Driving and operating road vehicles back up — phrasal verb with back /bæk/ verb ► F0 If traffic backs up, the vehicles have to wait in a long line because there are too many of them: » The traffic is starting to back up on the M25.Thesaurus+: ↑Traffic jams |
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