gusya (-seye)     v    to grind
grind    gusya, gukwema, kunoza, kumenagura, gusyokora
(in wooden mortar) gusekura
(poorly, coarsely) guhera
(quickly) gukwemagura
(to crush grain before grinding) kuvūngurīsha
En-En dictionary 
 gusya found in: Kirundi I (Study lessons)
lesson 63   Some Household Terms