rumble    (of earthquake, or approaching storm) umugigimo
(in stomach) kuborōga, kugonga
(thunder) guhīnda
En-En dictionary 
kuborōga (-borōze)     v    1. to wail, 2. cry out for help, 3. to moan, 4. rumble in stomach
guhīnda (-hīnze)     v    1. to turn away (vt), to chase away, 2. tu rumble (thunder)
kugonga (-gonze)     v    to rumble in stomach
kuvūnguka (-vūngutse)   v    1. to crush, 2. to crumb easily, to crumble
umutāsi (aba-)     1  class 1
singular: umu-
plural: aba-
  
1. complainer, grumbler, 2. troublemaker
earthquake    umushītsi, igishītsi
(rumble of) umugigimo
(to quake) kunyiganyiga, gutigita
En-En dictionary 
crumble    (to) kuvūnguka
En-En dictionary