backchannel
C1CEFR level
55/100Rarity: uncommon
NeutralRegister
An informal or unofficial line of communication used, especially in diplomacy, to negotiate away from public view.
A secret backchannel through a neutral capital kept talks alive even after the official negotiations collapsed.
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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