sub rosa
C2CEFR level
89/100Rarity: very rare
FormalRegister
In confidence or secrecy; privately and off the record.
The merger was negotiated sub rosa long before any public announcement.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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