sgrossare

Etymology
From.

Verb

 * 1) to rough-hew (a sculpture, etc.)
 * 2) to sketch out (a piece of writing)
 * 3)  to instruct (someone) in the rudiments of a field
 * 4) to refine (someone)
 * 5) to purify (water) coarsely
 * 1) to purify (water) coarsely