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Question:

What is a "pull-up?"

A Pulling forward while backing a trailer to reposition it
Explaination

When backing a vehicle, especially a tractor-trailer, you may need to pull forward to straighten the vehicle or reposition it for a better angle. This corrective maneuver is called a pull-up. Note, however, that you should be able to back your vehicle successfully without too many such corrections. During your CDL skills test, your examiner may penalize you for too many pull-ups.