Meaning

verb silence (someone) by uttering `shush!'

originBorrowed from Persian شوش (šuš), from Middle Persian 𐭮𐭥𐭱𐭩 (sūš), from Old Persian 𐏂𐎢𐏁𐎠 (çūšā), from Elamite 𒀸𒋗𒊺𒂗 (šušen). Doublet of Susa and Sus.

Etymology from Wiktionary, CC BY-SA 3.0