se taire
Think I'll keep quiet like her husband?
Tu crois que je vais me taire comme son mari ?
— La Dolce Vita (1960)
I made a small request that she keep quiet.
Je lui ai demandé de se taire.
— Munna Bhai M.B.B.S. (2003)
I would be much obliged if you could keep quiet.
Je vous serais très reconnaissant de bien vouloir garder le silence.