Meaning of “preserve” - Learner’s Dictionary

preserve

verb [ T ] uk us /prɪˈzɜːv/
KEEP THE SAME

B2 to keep something the same or prevent it from being damaged or destroyed:

to preserve peace
to preserve the environment
TREAT

to add substances to something so that it stays in good condition for a long time:

to preserve food/wood

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