Sit down.
ထုိင္စမ္း။

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Be quiet.
Quiet!
Let's be quiet.
ၿငိမ္ၿငိမ္ေန။

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Shhh!
Hush!
ရွဴး။ တိတ္တိတ္ေန။

Not another word!
အသံမထြက္နဲ႔ေတာ႔။

I don't want to hear a (nother) peep out of you! (a peep = a sound)
I don't want to hear a single peep out of you!
အသံထပ္မထြက္နဲ႔ေတာ႔ေနာ္။