 |
| |||
| under lock and key (The reliefs were discovered in 1962 but have been kept under lock and key ever since and have never gone on public display before. ArcticFox); behind seven seals (locked behind seven seals Alexander Demidov) | |||
| be inaccessible to like a sealed book | |||
| top-secret | |||
| за семью печатями: 21 фраза в 6 тематиках |
| Библия | 2 |
| Идиоматическое выражение, фразеологизм | 3 |
| Книжное/литературное выражение | 1 |
| Макаров | 1 |
| Общая лексика | 12 |
| Разговорная лексика | 2 |