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Etymology 1
Follows from the diachronic convergence of from  and  from 🇨🇬. Morphologically, an iterative of 🇨🇬.

Verb

 * 1) to sharpen, to hone, to whet
 * 2) to produce, to make using a lathe
 * 3) to wear away, to wear down
 * 4)  to nag
 * 1) to wear away, to wear down
 * 2)  to nag
 * 1)  to nag

Etymology 2
, causative of.

Verb

 * 1)  to emit, to exude (smell, light, etc.)
 * 2)  to shed (tears)