Meaning of “curb” - Learner’s Dictionary

curb

noun [ C ] uk us /kɜːb/
LIMIT

something that limits or controls something:

They are proposing a curb on tobacco advertising.
ROAD

US spelling of kerb (= the edge of the raised path at the side of the road)

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