1. tick off put a check mark on or near or next to
  2. takeoff a departure; especially of airplanes
  3. touch off put in motion or move to act
  4. take off remove clothes
  5. toss off write quickly
  6. top off fill to the point of almost overflowing
  7. knock off get rid of (someone who may be a threat) by killing
  8. throw off get rid of
  9. choke off become or cause to become obstructed
  10. kick off commence officially
  11. back off move backwards from a certain position
  12. doze off change from a waking to a sleeping state
  13. tell off reprimand
  14. knockoff a cheap copy or imitation, especially of a costly product
  15. time off a time period when you are not required to work
  16. kickoff (football) a kick from the center of the field to start a football game or to resume it after a score
  17. tear off rip off violently and forcefully
  18. pick off pull or pull out sharply
  19. tip off give insider information or advise to
  20. tip-off inside information that something is going to happen