Back

adv.
  1. In, to, or toward, the rear; as, to stand back; to step back.
  2. To the place from which one came; to the place or person from which something is taken or derived; as, to go back for something left behind; to go back to one's native place; to put a book back after reading it.
  3. To a former state, condition, or station; as, to go back to private life; to go back to barbarism.
  4. (Of time) In times past; ago.
  5. Away from contact; by reverse movement.
  6. In concealment or reserve; in one's own possession; as, to keep back the truth; to keep back part of the money due to another.
  7. In a state of restraint or hindrance.
  8. In return, repayment, or requital.
  9. In withdrawal from a statement, promise, or undertaking; as, he took back the offensive words.
  10. In arrear; as, to be back in one's rent.
    11. Back and forth ,
    backwards and forwards; to and fro.
    To go back on ,
    to turn back from; to abandon; to betray; as, to go back on a friend; to go back on one's professions.