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| under wraps (КГА); hugger-mugger; secret; on the quiet; in petto; on the down-low (chiefly black slang. on the quiet; in secret: he kept his status as a Hell's Angel on the down-low. NOED Alexander Demidov); on the low (urbandictionary.com NGGM); in silence (от окружающих: It's not uncommon for people to suffer in silence. Abysslooker) | |||
| under seal of secrecy | |||
| lowkey (SvezhentsevaMaria) | |||
| в тайне: 183 phrases in 28 subjects |