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Meaning of on a need-to-know basis | Babel Free

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 also

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