Meaning of “limit” - Learner’s Dictionary

limit

verb [ T ] us uk /ˈlɪmɪt/
software that limits access to the Internetfarming methods that limit damage to the environmentPoor diet in childhood can limit growth.The drug may help limit the spread of the disease.Limit the amount of coffee you drink.

B2 to control something so that it is less than a particular amount or number:

I try to limit the amount of fat that I eat.
We'll have to limit the number of guests.

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