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| trade secret (informal a piece of information that you are not willing to tell anyone My aunt won't tell anyone her age – she says that it's a trade secret. CALD. Alexander Demidov); dead secret (Olga Fomicheva); deep secret | |||
| graveyard | |||
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большой секрет : 8 phrases in 5 subjects |
| American usage, not spelling | 1 |
| General | 2 |
| Military | 2 |
| Politics | 1 |
| Urology | 2 |