In tennis, the area inside the inner wall of a real tennis court where the spectators sit, or the spectators themselves in historical tennis.
From French 'dedans' meaning 'within' or 'inside,' used to describe the gallery section inside the tennis court walls in 16th-17th century France during the early development of the sport.
Real tennis is so old that it has its own geography and language—dedans refers to the packed galleries where nobles would watch matches, and the term shows how games create their own special vocabulary.
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