straighten

straighten
straight‧en /ˈstreɪtn/ verb1. [intransitive and transitive] (also straighten out) to become straight, or to make something straight:
    Can you straighten your leg?
2. [intransitive] (also straighten up) to make your back straight, or to stand up straight after bending down
3. [transitive] (also straighten up) to make something tidy:
    Mum told me to straighten my room.
     
straighten out phrasal verb
  1. straighten something ↔ out to deal with problems or a confused situation and make it better, especially by organizing things
   SYN  sort out:
    There are several financial problems that need to be straightened out quickly.
  2. to become straight, or to make something straight:
    The path soon bends to the right, then straightens out.
    straighten something ↔ out
    She straightened out her legs.
  3. to improve your bad behaviour or deal with personal problems, or to help someone do this:
    He straightened out when he joined the army.
    straighten somebody ↔ out
    Her parents changed her school, hoping it would straighten her out.
straighten up phrasal verb
  1. to make your back straight, or to stand up straight after bending down:
    He remained bent over for several seconds before slowly straightening up.
  2. straighten something ↔ up to make something tidy
  3. American English to begin to behave well after behaving badly:
    You’d better straighten up, young lady!