elephant door
n.β Β«Although the Civic Center has what the entertainment industry calls an “elephant door”βan extremely large opening that would be big enough to accommodate elephants from the days of circusesβthe ride was just a few inches too tall.Β» ββFacing one crisis at a time” by Genevieve Diesing Journal Star (Peoria, Illinois) July 22, 2007. (source: Double-Tongued Dictionary)