| 释义 |
back upv adv [I](esp. of traffic or water) to collect in a place because something is preventing it from moving堵塞（尤指交通或流水）The traffic is starting to back up on the M25.在25号公路上交通开始堵塞。Our sink is backing up (= water is not flowing out of it)--we'd better call a plumber.洗涤槽堵塞了，我们得请水管工来瞧瞧。
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