How To Use Keep mum In A Sentence

Please will everyone keep mum about Saturday. We want to give them a real surprise.
We had been separated from the rest of humanity with solemn and legally binding promises to keep mum.
So this posole is going to be heavily chicken based, though I'm not averse to using something like pigs feet or head to give the broth some body and keep mum about it. Posole
They chose to keep mum then and now are raising a furore over bad roads.
It's not official yet so keep mum.

But the so called ' leaders ' keep mum and even some of them encourage the bureaucrats to carry on with their bureaucratic bunglings.
They chose to keep mum then and now are raising a furore over bad roads.
I'm trying to keep Mum sweet so that she'll lend me the car.
Keep mum about our surprise party.