Meaning of “conserve” - Learner’s Dictionary

conserve

verb [ T ] uk us /kənˈsɜːv/
NOT WASTE

to use something in a way that does not waste it:

Insulating the walls will help to conserve heat.
NOT HARM

to prevent harm or damage to animals or places

(Definition of “conserve” from the Cambridge Learner’s Dictionary © Cambridge University Press)