Noun

1. An edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)
2. A horse's bit with an attached chain or strap to check the horse
3. A stock exchange in new york
4. The act of restraining power or action or limiting excess

Verb

1. Lessen the intensity of; temper; hold in restraint; hold or keep within limits
2. To put down by force or authority
3. Keep to the curb
4. Place restrictions on