As for the window, you didn't say to keep it shut.

A balcony door should have a bar to keep it shut.

My mouth doesn't need any special arrangement to keep it shut.

When he reached for the doorknob, she put her hand on the door to keep it shut.

I leaned a chair against the door to keep it shut.

"So why the hell didn't you keep your damned mouth shut?"

I would not even consider asking him to keep it shut.

I can't see how they can afford to keep it shut.

And if we keep our mouths shut, they think we're hiding something.

Until then we keep our mouths shut, and I mean especially the twins.