a primitive root; properly, to plump, i.e. fill up hollows; by implication, to cover (for clothing or secrecy); clad self, close, clothe, conceal, cover (self), (flee to) hide, overwhelm. Compare כָּשָׂה.
or (for alliteration with מֶשִׁי) שְׁשִׁי; for שַׁיִשׁ; bleached stuff, i.e. white linen or (by analogy) marble; [idiom] blue, fine (twined) linen, marble, silk.