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on a need-to-know basis

Adverb CEFR C2

Definitions

remaining secret or hidden until it is needed to be known (by a particular party).

not-comparable

CEFR level

C2
Mastery
This word is part of the CEFR C2 vocabulary — mastery level.
See all C2 English words →

See also

on a stretch on accident on and off on and on on book on dead dogs

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