Definitions from Wiktionary (be not to know)
▸ verb: (UK, especially in the past) To not have the required information.
▸ verb: Used other than figuratively or idiomatically: see be, not, to, know.
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▸ verb: (UK, especially in the past) To not have the required information.
▸ verb: Used other than figuratively or idiomatically: see be, not, to, know.
Similar:
ignore,
pass unnoticed,
unmention,
unexist,
make neither head nor tail of,
unbefit,
bean't,
nonexist,
unsay,
remain to be seen,
more...
Opposite:
▸ Words similar to be not to know
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▸ Wikipedia articles (New!)
▸ Words that often appear near be not to know
▸ Rhymes of be not to know
▸ Invented words related to be not to know