Yes, curbs is a Scrabble word!

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

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