A network of interconnecting rabbit burrows, or any maze-like area with many passages.
From Old French 'warenne' meaning 'game park', derived from Frankish 'warōn' meaning 'to protect'. Originally referred to enclosed hunting grounds for rabbits and other game animals in medieval times.
The evolution from 'protected hunting ground' to 'rabbit's underground maze' shows how language follows life - as rabbits took over abandoned warrens, the word shifted to describe their elaborate tunnel systems. Today we use it metaphorically for any confusing network of passages or spaces.
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