0 to stop talking or making a noise, or to make someone do this: --
The kids kept saying how hungry they were, so their father gave them some biscuits to shut them up.
figurative If you breathe a single word to the police, we'll shut you up for good (= kill you).
My dad never stops talking. It's impossible to shut him up!
I wish you'd shut up for a moment and listen to what the rest of us have to say.