Definition of rabbit warren noun from the Oxford Advanced American Dictionary

     

    rabbit warren

     noun
    noun
     
    (also warren)
     
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  1. 1a system of holes and underground tunnels where wild rabbits live
  2. 2 (disapproving) a building or part of a city with many narrow passages or streets The English department offices were a real rabbit warren.
See the Oxford Advanced Learner's Dictionary entry: rabbit warren