1. ubiquitous being present everywhere at once
  2. backwoods a remote and undeveloped area
  3. back tooth a tooth situated at the back of the mouth
  4. back down move backwards from a certain position
  5. back door an entrance at the rear of a building
  6. back out move out of a space backwards
  7. packhorse a workhorse used as a pack animal
  8. pick out pick out, select, or choose from a number of alternatives
  9. pack ice a large expanse of floating ice
  10. packet a small package or bundle
  11. backwards in a manner or order or direction the reverse of normal
  12. backstay a stay that supports the back of something
  13. peach tree cultivated in temperate regions
  14. pack tent a tent that can be carried in a backpack
  15. pachytene the third stage of the prophase of meiosis
  16. pact a written agreement between two states or sovereigns
  17. backdown a retraction of a previously held position
  18. packed filled to capacity
  19. backless lacking a back
  20. back saw a handsaw that is stiffened by metal reinforcement along the upper edge

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