Her parents sent her to boarding school to 'straighten' her 'out'.
He took time to 'straighten out' the papers on his desk.
You need to 'straighten out' your legs for this stretch.
(..) He flies off the handle sometimes, but we're good friends. I have a business to run. I've got to kick asses sometimes. We had an argument, so I had to straighten him out. You straightened my brother out? He was banging cocktail waitresses! Players couldn't get a drink. What's wrong with you? (..)1972 The Godfather