curbing
  邊石,邊石的材料
  Curb v. t. [imp. & p. p. Curbed p. pr. & vb. n. Curbing.]
  1. To bend or curve. [Obs.]
     Crooked and curbed lines.   --Holland.
  2. To guide and manage, or restrain, as with a curb; to bend to one's will; to subject; to subdue; to restrain; to confine; to keep in check.
     Part wield their arms, part curb the foaming steed.   --Milton.
     Where pinching want must curb thy warm desires.   --Prior.
  3. To furnish with a curb, as a well; also, to restrain by a curb, as a bank of earth.
  curbing
       n : an edge between a sidewalk and a roadway consisting of a
           line of curbstones (usually forming part of a gutter)
           [syn: curb, kerb]