| No. | Item | Definition |
|---|---|---|
| 1. | abandoning | leaving without support |
| 2. | accusing | charging with wrongdoing |
| 3. | acting as informer | reporting on others secretly |
| 4. | acting falsely | behaving in a disloyal way |
| 5. | backstabbing | harming someone by secret disloyalty |
| 6. | being deceitful | acting dishonestly |
| 7. | being false to | acting disloyally toward |
| 8. | being treacherous | acting with betrayal |
| 9. | being unfaithful to | not sexually or emotionally loyal |
| 10. | blabbing | talking about secrets carelessly |
| 11. | breaking faith with | violating trust or loyalty |
| 12. | breaking trust | destroying confidence or loyalty |
| 13. | changing sides | moving loyalty to opponents |
| 14. | cheating on | being sexually unfaithful to |
| 15. | collaborating with | helping the opposing side |
| 16. | conning | deceiving for advantage |
| 17. | consorting with | associating disloyally with |
| 18. | conspiring against | secretly joining against |
| 19. | crossing | acting treacherously against |
| 20. | cuckolding | making a partner sexually betrayed |
| 21. | deceiving | misleading or tricking someone |
| 22. | delivering up | surrendering to another party |
| 23. | deserting | leaving disloyally |
| 24. | disclosing | making private information known |
| 25. | disloyal to | not faithful or supportive |
| 26. | divulging | revealing secret information |
| 27. | double-crossing | deceiving through treachery |
| 28. | duping | deceiving easily |
| 29. | exposing | making known or visible |
| 30. | faithless to | not loyal to |
| 31. | false to | disloyal toward |
| 32. | falsifying | making false or deceptive |
| 33. | feigning loyalty | pretending to be loyal |
| 34. | finking on | informing on someone |
| 35. | forsaking | abandoning or renouncing loyalty |
| 36. | fraternizing with | mixing with the opposing side |
| 37. | giving away | revealing or exposing |
| 38. | giving over | yielding into another’s hands |
| 39. | giving someone away | exposing or revealing someone |
| 40. | giving someone up | revealing or surrendering someone |
| 41. | giving up | surrendering or revealing someone |
| 42. | going behind one’s back | acting secretly against someone |
| 43. | going over to | joining the other side |
| 44. | grassing on | informing on someone |
| 45. | handing over | delivering into another’s control |
| 46. | handing someone over | delivering someone to others |
| 47. | hoodwinking | tricking by deception |
| 48. | implicating | showing involvement in wrongdoing |
| 49. | incriminating | making someone seem guilty |
| 50. | informing against | giving information against |
| 51. | informing on | reporting someone to authorities |
| 52. | leaking | secretly releasing information |
| 53. | leaving in the lurch | abandoning when needed |
| 54. | letting down | failing someone who trusted you |
| 55. | letting out | making something secret known |
| 56. | letting slip | revealing unintentionally |
| 57. | lying to | saying false things to |
| 58. | misleading | causing someone to believe falsely |
| 59. | misrepresenting | presenting falsely |
| 60. | naming names | revealing who was involved |
| 61. | narking on | informing on someone |
| 62. | outing | revealing hidden identity or facts |
| 63. | peaching on | informing against someone |
| 64. | perfidious to | treacherously unfaithful to |
| 65. | philandering on | having affairs against a partner |
| 66. | playing false | acting dishonestly or disloyally |
| 67. | playing traitor | acting as a betrayer |
| 68. | plotting against | secretly planning harm against |
| 69. | ratting on | informing against someone |
| 70. | ratting out | betraying by informing |
| 71. | recreant to | disloyal to duty or trust |
| 72. | reneging on | failing to honor a promise |
| 73. | revealing | making secret information known |
| 74. | sabotaging | deliberately damaging secretly |
| 75. | selling down the river | treacherously handing someone over |
| 76. | selling out | betraying for personal gain |
| 77. | shopping | informing against someone |
| 78. | snitching on | telling on someone secretly |
| 79. | spilling | revealing information carelessly |
| 80. | squealing on | informing on someone |
| 81. | stabbing in the back | betraying secretly and cruelly |
| 82. | straying from | becoming unfaithful to |
| 83. | subverting | secretly weakening loyalty or order |
| 84. | tattling on | reporting someone’s wrongdoing |
| 85. | telling on | reporting someone’s misdeeds |
| 86. | testifying against | giving evidence against |
| 87. | throwing under the bus | sacrificing to save oneself |
| 88. | tricking | deceiving by cunning |
| 89. | turncoating | switching sides disloyally |
| 90. | turning in | reporting someone to authorities |
| 91. | turning on | suddenly acting against |
| 92. | turning over | handing someone to others |
| 93. | two-timing | being romantically unfaithful |
| 94. | undermining | weakening secretly from within |
| 95. | violating confidence | disclosing trusted information |
| 96. | violating trust | breaking someone’s confidence |
| 97. | walking out on | abandoning someone suddenly |
| 98. | witnessing against | speaking against as witness |
| 99. | working against | acting in opposition to |
| 100. | yielding up | surrendering to another |