The word has virtually no internal source of derivation and could be easily considered a borrowing from Akk *šāṭiru—if such a word had ever existed (Kogan–Krebernik 2021a:392, fn. 131).
The history of this root and its meaning being equal in such geographically and genealogically remote idioms as Akkadian, Arabic and ESA, but virtually absent from Aramaic, is enigmatic. Cf. Kogan–Krebernik 2021a:392f. for the discussion.