Meaning of “reserve” - Learner’s Dictionary

reserve

verb [ T ] uk us /rɪˈzɜːv/
ARRANGE

B1 to arrange to have a seat on an aircraft, a room in a hotel, etc:

I'd like to reserve two seats on the 9:15 to Birmingham.
PARTICULAR USE

B1 to not allow people to use something because it is only for a particular person or for a particular purpose:

This seat is reserved for elderly or disabled passengers.

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