1. back down move backwards from a certain position
  2. backdown a retraction of a previously held position
  3. bog down get stuck while doing something
  4. peg down fasten or secure with a wooden pin
  5. bunk down go to bed
  6. break down stop operating or functioning
  7. buckle down start working very hard
  8. back door an entrance at the rear of a building
  9. breakdown the act of disrupting an established order so it fails to continue
  10. lockdown the act of confining prisoners to their cells
  11. duck down down of the duck
  12. kick down open violently
  13. takedown being brought to the mat from a standing position
  14. backdoor an entrance at the rear of a building
  15. knock down cause to come or go down
  16. shakedown extortion of money (as by blackmail)
  17. knock-down strong enough to knock down or overwhelm
  18. backbone the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
  19. take down move something or somebody to a lower position
  20. backwoods a remote and undeveloped area