In the passage, "urban sprawl" refers to the uncontrolled expansion of urban areas into surrounding rural lands. It often involves the unplanned and inefficient spread of cities, resulting in increased congestion, environmental degradation, and reduced agricultural or natural areas. The opposite of "sprawl" would be the controlled, planned, or organized growth or development of urban areas, which may involve strategies like compact urban planning, efficient land use, or sustainable development. "Contraction" in this context implies the opposite, indicating a reduction or controlled decrease in urban expansion or sprawl.