| Main Entry: | |
| Part of Speech: | noun |
| Definition: | incitement, stimulus |
| Synonyms: | affront, annoyance, bothering, brickbat, casus belli, cause, challenge, dare, defy, grabber, grievance, grounds, harassment, incentive, indignity, inducement, injury, instigation, insult, irking, justification, motivation, offense, provoking, reason, taunt, vexation, vexing |
| Antonyms: | prevention, repression, suppression |
| Main Entry: | root of the matter |
| Part of Speech: | noun |
| Definition: | heart of an issue |
| Synonyms: | casus belli, root of the trouble |