- To make straight.
- Straighten out your necktie and comb your hair.
- (idiomatic) To correct or rectify.
- I hope they can straighten out the problem with my bill soon.
- (idiomatic) 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.
- (intransitive, idiomatic) To correct; to stop doing something wrong.
- It is not enough to stand aside and hope problems straighten out on their own.