| No. | Item | Definition |
|---|---|---|
| 1. | abort | stop before completion |
| 2. | annul | declare invalid |
| 3. | anticipate | act before to prevent |
| 4. | arrest | stop development |
| 5. | avert | keep from happening |
| 6. | ban | officially not allow |
| 7. | bar | block or prohibit |
| 8. | blacklist | exclude from approval |
| 9. | block | stop or obstruct |
| 10. | blunt | make less effective |
| 11. | check | hold back |
| 12. | choke off | stop by blocking |
| 13. | clog | block passage |
| 14. | close off | block access to |
| 15. | constrain | limit or restrict |
| 16. | cordon off | block access to |
| 17. | curb | restrain or limit |
| 18. | cut off | stop before continuation |
| 19. | cut short | end earlier than planned |
| 20. | debar | shut out officially |
| 21. | delay | postpone or slow |
| 22. | deny | refuse to grant |
| 23. | deprive | prevent from having |
| 24. | deter | discourage or prevent |
| 25. | disallow | refuse to permit |
| 26. | discontinue | stop continuing |
| 27. | disqualify | make ineligible |
| 28. | eliminate | remove completely |
| 29. | eradicate | wipe out |
| 30. | exclude | keep out |
| 31. | extinguish | put an end to |
| 32. | fence out | keep from entering |
| 33. | filter out | remove or exclude |
| 34. | foil | prevent from succeeding |
| 35. | forbid | not allow |
| 36. | foreclose | prevent from being considered |
| 37. | forestall | prevent by acting first |
| 38. | freeze out | exclude deliberately |
| 39. | frustrate | prevent from succeeding |
| 40. | guard against | take steps to prevent |
| 41. | hamper | hold back progress |
| 42. | head off | prevent in advance |
| 43. | hinder | make difficult |
| 44. | hold back | restrain or prevent |
| 45. | hold up | delay or obstruct |
| 46. | impede | slow or obstruct |
| 47. | inhibit | restrain or hinder |
| 48. | interfere with | hinder or disrupt |
| 49. | interrupt | stop temporarily |
| 50. | invalidate | make ineffective |
| 51. | jam | block movement |
| 52. | keep back | withhold or restrain |
| 53. | keep from | prevent from doing |
| 54. | leave no chance for | allow no opportunity for |
| 55. | leave no room for | allow no possibility of |
| 56. | lock out | deny entry to |
| 57. | make impossible | cause to be impossible |
| 58. | militate against | work against |
| 59. | neutralize | make ineffective |
| 60. | nip in the bud | stop at an early stage |
| 61. | nullify | make legally void |
| 62. | obstruct | get in the way of |
| 63. | obviate | make unnecessary |
| 64. | oppose | act against |
| 65. | outlaw | make illegal |
| 66. | preempt | take action first |
| 67. | prevent | stop from happening |
| 68. | price out | make unaffordable |
| 69. | prohibit | officially forbid |
| 70. | put a stop to | end or prevent |
| 71. | put an end to | stop completely |
| 72. | put paid to | finish off decisively |
| 73. | quash | suppress completely |
| 74. | refuse | decline to allow |
| 75. | render impossible | make unable to happen |
| 76. | restrain | hold back |
| 77. | revoke | officially cancel |
| 78. | root out | remove completely |
| 79. | rule out | make impossible |
| 80. | scotch | put an end to |
| 81. | screen out | exclude by filtering |
| 82. | seal off | close completely |
| 83. | shut off | stop the flow of |
| 84. | shut out | keep from entering |
| 85. | stall | cause to stop |
| 86. | stem | stop or check |
| 87. | stop | bring to an end |
| 88. | stymie | block progress |
| 89. | suppress | put down or stop |
| 90. | terminate | bring to an end |
| 91. | thwart | prevent success |
| 92. | tie up | occupy or block |
| 93. | undercut | weaken or hinder |
| 94. | veto | reject or block |
| 95. | void | cancel or nullify |
| 96. | wall off | isolate or block |
| 97. | ward against | guard from harm |
| 98. | ward off | keep away |
| 99. | withhold | keep back |
| 100. | work against | have a harmful effect |