Undergrowth usually refers to natural environments, like forests, not urban areas. They set up camp away from the forest's undergrowth to avoid wildlife.
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Impedes movement
Undergrowth can make movement difficult, often used to describe challenging terrain. The hikers found their path blocked by thick undergrowth.
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Associated with mystery
Undergrowth can imply a mysterious or unexplored area, often in stories. Legend says a treasure is hidden within the undergrowth of these woods.