What is the meaning of curb?

noun

• An edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter.
  • synonyms: curbing, kerb
• A horse's bit with an attached chain or strap to check the horse.
  • synonyms: curb bit
• A stock exchange in New York.
  • synonyms: American Stock Exchange, AMEX
• The act of restraining power or action or limiting excess.
  • usage: "his common sense is a bridle to his quick temper"
  • synonyms: bridle, check

verb

• Lessen the intensity of; temper; hold in restraint; hold or keep within limits.
  • usage: "moderate your alcohol intake"; "hold your tongue"; "hold your temper"; "control your anger"
  • synonyms: control, hold in, hold, contain, check, moderate
• To put down by force or authority.
  • usage: "suppress a nascent uprising"; "stamp down on littering"; "conquer one's desires"
  • synonyms: suppress, stamp down, inhibit, subdue, conquer
• Keep to the curb.
  • usage: "curb your dogs"
• Place restrictions on.
  • usage: "curtail drinking in school"
  • synonyms: restrict, curtail, cut back