crumb    akavunguka
En-En dictionary 
kuvūnguka (-vūngutse)   v    1. to crush, 2. to crumb easily, to crumble
akavunguka (utu-  7  class 7
singular: aka-,aga-
plural: utu-,udu-
  
crumb
kuvūngagurika (-vūngaguritse)   v    to become crumbs
ubuvunguka   8  class 8
singular: ubu-
  
(no pl.) crumbs, chips of wood
udukorokera    7    crumbs
crumbs    udukorokera, ubuvunguka, utuvunguka
(to become ~) kuvūngagurika
(to ~ easily) kuvūnguka
En-En dictionary 
crumble    (to) kuvūnguka
En-En dictionary