straighten out

verb7

1. •
   To make straight.

   • Straighten out your necktie and comb your hair.
2. •
   To correct or rectify.

   • I hope they can straighten out the problem with my bill soon.
3. •
   To correct; to stop doing something wrong.

   • It is not enough to stand aside and hope problems straighten out on their own.
4. •
   To eliminate confusion from or concerning.

   • As soon as I straighten out which of the twins is which, I'll start calling them by their names.
5. •
   To tidy, neaten, or organize.
6. •
   (informal) To make heterosexual.

   • Most biological mistakes can be treated with modern plastic surgery and prostheses. I've never heard of a gay person "successfully" "straightened out". You can't erase instinct! — 1999
7. •
   To be made a made man in a Mafia organization.