K-S-H – ‘fill up’

3680.  kacçah, kaw-saw´; a primitive root; properly, to plump, i.e. fill up hollows; by implication, to cover (for clothing or secrecy)

KSH This root is applied in general to the idea of a movement of vibration which agitates and expands the air. (The Hebraic Tongue Restored, Fabré d’Olivet, p. 376)