Quick definitions from WordNet (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 ("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)

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▸ Also see curb