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1. a rim, esp. of joined stones or concrete, along a street or roadway, forming an edge for a sidewalk.
curb (plural curbs) (American spelling) A concrete margin along the edge of a road; a kerb (UK, Australia, New Zealand). A raised margin along the edge of something, such as a well or the eye of a dome, as a strengthening. (figurative) Something that checks or restrains; a restraint. quotations