EXAMPLES FROM THE WEB FOR STRAIGHTEN UP
You've got to get some sleep: that's the only way for you to straighten up.
My back pains so sometimes I cannot stand on my feet or straighten up.
It was so heavy he had to help her straighten up; she could not rise alone.
Before he could straighten up he turned his head like a flash.
So I did my best first of all to straighten up John's appearance.
But if you want to help, you might straighten up this table.
I live for nothing, and I straighten up the accent of the prettiest English lips.
So it went on, until to-day we could not straighten up if we were to try.
Meantime you can straighten up this lab and find out where things are.
He is quite likely to straighten up and say: "Oh, brace up, Pauline!"