leaven    umwāmbiro
(to ~) kwāmbira
En-En dictionary 
rise    (arise from lying) kuvyūka
(of sun) kubāndūka, kurasa (e.g. umutwēnzi urabāndūtse)
(of anything containing leaven) gukuka, gukakama, gututūmba
(from the dead) kuzūka
En-En dictionary 
gukuka (-kutse)   v    to rise, to swell (of anything containing leaven)
kudūga (-dūze)     v    1. to go up (as a hill), to ascend, 2. to rise (as bread, or anything containing leaven), 3. to increase
kwāmbira (-āmbiye)     v    to leaven, to ferment
umwāmbiro (imy-)     2  class 2
singular: umu-
plural: imi-
  
leaven, fermenting agent