noun
a densely populated or labyrinthine building or district
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The warren of interconnected tunnels and burrows provided a safe haven for the rabbits.
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I heard there's a huge warren of rabbits living in the field behind the barn.
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Let's go check out that warren over there, I bet we can find some rabbits to pet.
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The bustling city was a warren of narrow streets and alleys, making it easy to get lost.