A curb is the edge of the sidewalk beside the road. When you're using the word curb as a noun, it's the raised edging beside a street. When curb is a verb, it means to restrain or hold back, like when you curb your impulse to laugh while watching a badly acted play. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.