1. stack up arrange into piles or stacks
  2. stuck-up (used colloquially) overly conceited or arrogant
  3. stick up defend against attack or criticism
  4. stickup robbery at gunpoint
  5. stock up amass so as to keep for future use or sale or for a particular occasion or use
  6. stick by be loyal to
  7. slack up make less active or fast
  8. sack up make as a net profit
  9. stink up cause to smell bad; fill with a bad smell
  10. sweet cup the edible yellow fruit of the Jamaica honeysuckle
  11. stacked arranged in a stack
  12. stack an orderly pile
  13. suck up ingratiate oneself to; often with insincere behavior
  14. stacker a laborer who builds up a stack or pile
  15. stay up not go to bed
  16. strike up start playing
  17. stacks a large number or amount
  18. staccato (music) separating the notes
  19. stock a supply of something available for future use
  20. stockpot a pot used for preparing soup stock