adjective [ after verb ] UK /ˌbækt ˈʌp/ US /ˌbækt ˈʌp/
*If traffic is backed up, the vehicles have to wait in a long line because there are too many of them:
The traffic is backed up for six miles on the road to the coast
© Cambridge University Press 2020
At many border crossings around Europe, cars and trucks are backed up after leaders closed them to nonessential traffic. At one point, trucks were backed up in Austria for 28 kilometers and cars for 14 kilometers.
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FILE - In this slow-shutter zoom effect photo taken Dec. 12, 2018, commuters are backed up in traffic during the morning rush hour in Brussels, a city that regularly experiences pollution alert warnings.
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