As a verb unkill
is to bring (something killed) back to life.
As a preposition untill is
obsolete spelling of lang=en.
unkill
English
Verb
(
en verb)
(rare) To bring (something killed) back to life.
* 1992 , Kola Omojola, At the crossroads: challenges and options for Nigeria (page 231)
- We killed agriculture in the past. Now is the time to unkill it.