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n'en saura rien

won't know anything about it

→ ne
phrase Rare #43,064
won't know anything about it The phrase uses ne … rien to mean “nothing,” while en refers to something already mentioned or understood.
FR: Ne lui dis rien : elle n'en saura rien.
EN: Don't tell her anything: she won't know about it.

Ta maman n'en saura rien, va !

Your mom won't know a thing, come on!

— Enquête sur un citoyen au-dessus de tout soupçon (1970)

Personne n'en saura rien !

No one will ever know!

— In the Mood for Love (2000)

Il n'en saura rien.

He won’t know anything about it.

— Le Cercle des poètes disparus (1989)

Je mangerai le tien et ta mère n'en saura rien.

I'll eat yours, and your mother won't know anything about it.

— Salé, Sucré (1994)

Elle n'en saura rien.

She won't know anything about it.

Personne n'en saura rien.

No one will know anything about it.

— No (2012)