Meaning of “reduce” - Learner’s Dictionary

reduce

verb [ T ] us uk /rɪˈdjuːs/
Extra Examples
Our society needs to reduce its dependence on the car.The doctor gave me drugs to reduce the swelling in my ankle.Regular exercise can help reduce stress.Are these prices likely to be reduced any further?Carbon dioxide emissions will be reduced by 20%.

B1 to make something less:

to reduce air pollution
Prices have been reduced by almost 50 percent.
The number of employees was reduced from 500 to 300.

to add one or more electrons to a substance or to remove oxygen from a substance

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