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n'en saura rien

won't know anything about it

→ ne
phrase Rare #37,714
won't know anything about it Used with a singular third-person subject. The phrase literally means “will know nothing about it”; “en” refers to something understood from context.
FR: Il n'en saura rien.
EN: He won't know anything about it.

Il n'en saura rien.

He won’t know anything about it.

— Le Cercle des poètes disparus (1989)

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)

Personne n'en saura rien !

No one will ever know!

— In the Mood for Love (2000)

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)

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)