The phrase "curb on" is correct and usable in written English.
It is often used to refer to a restriction or limitation on something. For example: The government has imposed a new curb on public spending.
A curb on the number of nominee directorships any one person can hold.
A total ban from the airwaves – unlike exclusion from one programme – really would represent a serious curb on political freedom.
It is a significant curb on speech — and apparently incorrect.
Netanyahu has ordered only a temporary, partial curb on construction.
The greatest curb on growth is restricted demand.
Some readers may be cheering this curb on exam grades.
Hitched to a junk wagon, he was standing unattended at the curb on 3rd….
Hitched to a junk wagon, he was standing unattended at the curb on 3rd Ave.
Real democratic socialism would not mean the odd curb on energy prices.
Most commentators are portraying the ruling as another incremental curb on capital punishment.
Slower growth, he indicated, would act as its own curb on inflation.
