1. knock off get rid of (someone who may be a threat) by killing
  2. knockoff an unauthorized copy or imitation
  3. knock over cause to overturn from an upright or normal position
  4. knock out eliminate
  5. kick off commence officially
  6. knockout a blow that renders the opponent unconscious
  7. sneak off leave furtively and stealthily
  8. kickoff (football) a kick from the center of the field to start a football game or to resume it after a score
  9. knock on knocking the ball forward while trying to catch it
  10. check off put a check mark on or near or next to
  11. back off move backwards from a certain position
  12. tick off put a check mark on or near or next to
  13. knock deliver a sharp blow or push :"He knocked the glass clear across the room"
  14. neck ruff a high tight collar
  15. pick off pull or pull out sharply
  16. knocker a person who knocks (as seeking to gain admittance)
  17. bunk off play truant from work or school
  18. nod off change from a waking to a sleeping state
  19. pick-off a baseball play in which a base runner is caught off base and tagged out
  20. innocuous not injurious to physical or mental health

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