| No. | Item | Definition |
|---|---|---|
| 1. | barricade | a temporary block or defense |
| 2. | block | something that stops movement or action |
| 3. | blockade | an act or line blocking passage |
| 4. | border | an edge marking separation |
| 5. | boundary | a line marking limits |
| 6. | brake | something that slows or stops |
| 7. | breakwater | a structure blocking waves |
| 8. | breastwork | a low defensive wall |
| 9. | buffer | something that cushions or separates |
| 10. | bulwark | a strong protective defense |
| 11. | check | something that slows or restrains |
| 12. | chokepoint | a narrow place restricting passage |
| 13. | clog | something that blocks flow |
| 14. | closure | something that closes access |
| 15. | constraint | something that restricts freedom or action |
| 16. | cordon | a line preventing passage |
| 17. | crossbar | a bar placed across something |
| 18. | curb | something that restrains or limits |
| 19. | dead end | a route with no exit |
| 20. | deadlock | a standstill caused by opposition |
| 21. | demarcation | a clear dividing line |
| 22. | deterrent | something that discourages action |
| 23. | dike | a bank preventing flooding |
| 24. | divide | a line separating two sides |
| 25. | divider | something that separates areas |
| 26. | drag | something that slows progress |
| 27. | embankment | a raised bank forming a boundary |
| 28. | embargo | an official ban on trade |
| 29. | enclosure | something that closes off an area |
| 30. | encumbrance | something burdensome that hinders |
| 31. | entanglement | a complication that hinders movement |
| 32. | fence | a structure that blocks entry |
| 33. | fetter | a restraint on freedom or action |
| 34. | firewall | a system blocking unauthorized access |
| 35. | formalities | required procedures causing delay |
| 36. | frontier | a border or limit |
| 37. | gate | a movable barrier or entrance |
| 38. | grating | a framework of crossing bars |
| 39. | grille | a barred screen or covering |
| 40. | guard | something that protects or blocks |
| 41. | guardrail | a rail preventing passage or falls |
| 42. | hindrance | something that makes progress difficult |
| 43. | hurdle | a difficulty to overcome |
| 44. | impasse | a situation with no progress |
| 45. | impediment | something that obstructs progress |
| 46. | interface | a boundary where things meet |
| 47. | interference | something that gets in the way |
| 48. | jam | a blockage or congestion |
| 49. | latch | a fastening keeping something closed |
| 50. | levee | an embankment holding back water |
| 51. | limit | a point beyond which you cannot go |
| 52. | line | a limit or dividing mark |
| 53. | lock | a device preventing entry |
| 54. | logjam | a blockage causing delay |
| 55. | mesh | netlike material that screens |
| 56. | millstone | a burden that hinders progress |
| 57. | minefield | an area dangerous to cross |
| 58. | no-go line | a limit not to cross |
| 59. | obstacle | something that blocks progress |
| 60. | obstruction | something that blocks a path |
| 61. | opposition | active resistance or obstruction |
| 62. | palisade | a fence of stakes |
| 63. | paper wall | bureaucratic obstruction to progress |
| 64. | parapet | a low protective wall |
| 65. | partition | a divider separating spaces |
| 66. | perimeter | the outer boundary of an area |
| 67. | plug | something that stops an opening |
| 68. | problem | something that causes trouble |
| 69. | prohibition | an official ban or restriction |
| 70. | quarantine line | a boundary restricting movement |
| 71. | rail | a bar forming a boundary |
| 72. | railing | a protective barrier of rails |
| 73. | rampart | a defensive wall or bank |
| 74. | red tape | bureaucratic rules causing delay |
| 75. | regulation | a rule limiting action |
| 76. | resistance | opposition that blocks progress |
| 77. | restriction | a limit on action or access |
| 78. | retaining wall | a wall holding back earth |
| 79. | ring fence | a protective separating boundary |
| 80. | roadblock | something that prevents progress |
| 81. | screen | something that shields or blocks |
| 82. | screening | blocking view, access, or contact |
| 83. | sea wall | a wall against the sea |
| 84. | seal | something that closes tightly |
| 85. | separation | a division keeping things apart |
| 86. | separator | something that keeps things apart |
| 87. | snag | an unexpected obstacle or difficulty |
| 88. | stalemate | a deadlock with no movement |
| 89. | stop | something that halts movement or progress |
| 90. | stumbling block | something that causes difficulty or failure |
| 91. | trap | something that catches or hinders |
| 92. | tripwire | something triggering or blocking movement |
| 93. | turnstile | a gate controlling entry |
| 94. | upper bound | the highest allowed limit |
| 95. | veto | power to block a decision |
| 96. | wall | something that blocks passage |
| 97. | web | a network that entangles or blocks |
| 98. | weight | something that holds back progress |
| 99. | windbreak | a barrier reducing wind |
| 100. | yoke | a burdening restraint |