 |
| |||
| rare occurrence (Andrey Truhachev) | |||
| once-in-a-blue-moon occurrence (For most people, seeing a celebrity is a once-in-a-blue-moon occurrence. ART Vancouver) | |||
| rare event (that occur with low frequency Val_Ships) | |||
| rare event | |||
| редкое событие: 2 phrases in 2 subjects |
| Informal | 1 |
| Microsoft | 1 |