| central element(expression, reason, factor, seriousness) |
| chief reason(expression, reason, significance, fact) |
| issue main reason(expression, reason, significance, fact) |
| main culprit(expression, reason, significance, fact) |
| principal cause(expression, reason, significance, fact) |
| reason fundamental(expression, reason, significance, fact) |
| upstream cause(expression, reason, significance, fact) |
| fundamental principle(expression, cause, value, fact) |
| highlight(noun, reason, significance, factor) |
| key pillar(expression, cause, value, fact) |
| major premise(expression, reason, importance, fact) |
| underlying cause(expression, reason, importance, fact) |
| difference maker |
| centerpiece(noun, cause, reason, value, fact) |
| crunch point(expression, moment, influence, importance) |
| bottom line(expression, moment, influence, importance) |
| break point(expression, moment, influence, importance) |
| crucial moment(expression, moment, influence, importance) |
| crucial point(expression, moment, influence, importance) |
| crucial thing(expression, moment, influence, importance) |