What is Curb ?
Curb is (noun) 1. something which holds something back The company needs to put a curb on its spending. 2. US the stone edge to a pavement He sat on the curb and watched the cars go past. Try not to hit the curb when you park. (NOTE: The British spelling is kerb.)(verb) to hold something back She needs to curb her enthusiasm to spend money. Synonym restrain
source: Easier English, Student Dictionary Upper Intermediate Level