curb

lessen the intensity of; temper; hold in restraint; hold or keep within limits

a horse's bit with an attached chain or strap to check the horse

place restrictions on

a stock exchange in New York

an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)

the act of restraining power or action or limiting excess

keep to the curb

“curb your dogs”