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Meaning of be not to know | Babel Free

Verb CEFR C2

Definitions

To not have the required information.
UK, especially
Used other than figuratively or idiomatically: see be, not, to, know.

Examples

“You weren’t to know.”

You couldn’t have known.

CEFR level

C2

Mastery
This word is part of the CEFR C2 vocabulary — mastery level.

See also

be on be on at be on days be on nights be on one be on one's beanwater