Meaning of “deplete” - Learner’s Dictionary

deplete

verb [ T ] uk us /dɪˈpliːt/

to reduce the amount of something, especially a natural supply:

Alcohol depletes the body of B vitamins.
depletion uk us /dɪˈpliːʃən/ noun [ U ]

the depletion of the ozone layer

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