A dense, thick shrub or woody vegetation, particularly in arid or semi-arid regions, characterized by tough, spiny branches.
From 'brush' (thick vegetation) duplicated with 'bush' (a shrub), emphasizing density and toughness. It's a colloquial term rather than a scientific one.
In Australian slang, 'the brushbush' refers to remote wilderness areas—it's become shorthand for 'uncivilized nature,' revealing how English speakers literally doubted their own word enough to repeat it for emphasis.
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