Definitions of curb:

• noun:   an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)
• noun:   a horse's bit with an attached chain or strap to check the horse
• noun:   the act of restraining power or action or limiting excess
• noun:   a stock exchange in New York
• verb:   keep to the curb

  Example: "Curb your dogs"

• verb:   place restrictions on
• verb:   lessen the intensity of; temper; hold in restraint; hold or keep within limits
• verb:   to put down by force or authority
• name:  A surname (very rare: popularity rank in the U.S.: #27818)