Definition of back up in English:

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back up

1(Of vehicles) form a line due to congestion: the traffic began to back up
More example sentences
  • It is hoped this will combat problems resulting from the queue of taxis backing up into Kings Road.
  • Contractors are due to start work on January 13 to put in place a series of initiatives that they hope will help to ease congestion at locations where traffic constantly backs up.
  • Cars and other vehicles queued for hours to reach the fair, backing up through Stow Square and up to the Fosseway.
2(Of running water) accumulate behind an obstruction.
Example sentences
  • Often the water backs up because the drains are clogged.
  • When the sewers become overwhelmed with rainwater the overflows work to ensure water is prevented from backing up in the system.
  • When the foul water sewer is overcharged, the foul water backs up and can force open the manhole cover in Mr. Marcic's front garden, thereby escaping into the garden.
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