door
noun
[ dɔː ]
• a hinged, sliding, or revolving barrier at the entrance to a building, room, or vehicle, or in the framework of a cupboard.
• "she looked for her key and opened the door"
Origin:
Old English duru, dor, of Germanic origin; related to Dutch deur ‘door’ and German Tür ‘door’, Tor ‘gate’; from an Indo-European root shared by Latin foris ‘gate’ and Greek thura ‘door’.
at the door
• on admission to an event rather than in advance.
• "tickets will be available at the door"