2006, American Motoryclist - Jan 2006, Victory's Kingpin goes its own way
bank the big cruiser into the first of a series of corners, make a few quick left, right, left transitions, then the road straightens up for a stretch...

13 October 2010, Blackpool Gazette, 'Bad driving' led to biker death crash
He said "As I came out of the bend I went to straighten up the car and it just seemed to be carrying on turning."

Horse skin smells good. Lay your cheek against his neck and have a good cuddle. Now straighten up slowly again, and sit loosely.

1994, Mccook Daily Gazette, Jul 12, 1994, Mail Delivery Trying To Get Up To Speed
The Postal Service sent a special task force to straighten up the city's problems with a back-to-basics approach

The lockers were all standing wide open with equipment and uniforms scattered all over the room, he had left a note under the bottle telling me to straighten up the room, then straighten myself up before coming to work the next day.

Straighten up

Meaning

Verb