Where does “be quiet” come from?
be quiet (English) comes from English quiet, from Latin quiētus, from Latin quiēscō, from Latin quiēs, from Proto-Italic kʷiētis, from Proto-Indo-European kʷyéh₁tis, from Proto-Indo-European kʷyeh₁- — to rest; rest, peace.
be quiet (English): Remain silent
Ancestry of “be quiet”, step by step