What is the meaning of curbing?

noun

• An edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter.
  • synonyms: curb, kerb

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, curb, 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, curb
• Keep to the curb.
  • usage: "curb your dogs"
  • synonyms: curb
• Place restrictions on.
  • usage: "curtail drinking in school"
  • synonyms: restrict, curtail, curb, cut back