1. resolve or clarify a situation
straighten out an unresolved and messy situation
To 'straighten something out' can mean to literally make something straight, it can also mean to make something organised or tidy. You might 'straighten out a page of a newspaper' for example in order to read it clearly or 'straighten out the office' so it looks better or so you can find things more easily. This is a popular phrasal verb used in both social and professional contexts.