straighten up

/S T R EY1 T AH0 N AH1 P/
verb
  1. 1

    (intransitive) To sit up straight, to stop hunching.

  2. 2

    (intransitive) To become straight, or straighter.

  3. 3

    (transitive) To tidy; to tidy up.

  4. 4

    (transitive) To deal with; to put in order.

  5. 5

    (transitive) To clarify.

  6. 6

    (ambitransitive) To steer straight.

  7. 7

    (intransitive, idiomatic) To start living a reformed life; to adopt a more honest and respectable course of behavior.