| by bits and pieces(expression, adjective, idiom, irregular, erratic) |
| centennial(adjective, regular, routine, sporadic, intermittent) |
| chips are down(expression, idiom, important, significant, historic) |
| circling |
| classical(adjective, important) |
| considerable(important, significant, historic) |
| decisive(important, significant, historic) |
| earth-shaking(important, significant, historic) |
| earth-shattering(important, significant, historic) |
| eventful(important, significant, historic) |
| every once in a while(expression, adjective, idiom, regular, routine) |
| every so often(expression, adjective, idiom, regular, routine) |
| exemplary(adjective, important) |
| fateful(important, significant, historic) |
| grave(important, significant, historic) |
| heavy(important, significant, historic) |
| heavy number(expression, important, significant, historic) |
| here and there(expression, adjective, idiom, irregular, erratic) |
| hourly(adjective, regular, routine, sporadic, intermittent) |
| ideal(adjective, important) |