Today’s word: urusai
Urusai is the companion word to shitsukoi, at least to my mind. While shitsukoi has the connotation of annoying repetition, urusai just means “loud and noisy.” When used as an exclamation by my parents, it meant “shut up!”
Another way to tell me the same thing was Shizuka ni shinasai! or “Be quiet!”
I don’t remember any specific situations in which I was told to be quiet, but I imagine it had a lot to do with banging things around, not necessarily from talking loudly.