gutūba (-tūvye)     v    to grow smaller (sometimes used of moon)
diminish    (vt) kugabanya, kugerura, kugereranya, gutūvya
(vi) kubangūra, kugabanuka, kugeruka, gutūba, kuyōka
En-En dictionary 
grow    gukura, kwāruka, gukaka
(after cutting) kunaga
(larger, esp. moon) gutūbūka
(let hair ~ long) gutongoza
(old) gutāma
(rapidly in spurts) kuvugumuka
(smaller, sometimes used of moon) gutūba
(to cause to grow) gukuza
(to not ~, plant) kunyigīra
(to not ~, because of too many seeds) kuzīnga
(very fast, child) kugurugūmba
(well) kubaduka
(child that doesn't ~ properly) imfunnya
En-En dictionary 
moon    ukwēzi
(name of) Nzero
(to wane) gutūba
(to wax) gutūbūka
En-En dictionary 
small    –to, –toya, –tonya, –toto
(grow smaller) gutūba
(to make smaller) gutūvya
En-En dictionary 
wane    (moon) gutūba
En-En dictionary