lest    -ōye (verb with no infinitive)
En-En dictionary 
kwengēnga (-engēnze)     v    1. to rule kindly, 2. deal kindly with, 3. to carry very carefully lest it break or spill, 4. to be gentle
carry    guterura, gutwāra
(away, as water does) gukubebera
(carefully, lest it break or spill) kwengēnga
(for) gutwāza
(in basket, person not sick) kurerura
(on back) guheka
(on head) kwīkorera, kwīremeka
(on head, without using hands) kwirēngera
(and put down frequently) gusengenyeza
(water) kuvōma
En-En dictionary 
-ōye   v    1. don't (strong negative), 2. lest, (verb without infinitive)
 lest found in: Kirundi II (Grammar)
chapter 19   Strong Negative Imperatives