| 释义 |
back up
Ⅰ back (sth) up — phrasal verb with back /bæk/ verb ► F0 to drive backwardsThesaurus+: ↑Driving and operating road vehicles
Ⅱ 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 |