Definitions from Wiktionary ( )

▸ noun:  A portal of entry into a building, room, or vehicle, typically consisting of a rigid plane movable on a hinge. It may have a handle to help open and close, a latch to hold it closed, and a lock that ensures it cannot be opened without a key.
▸ noun:  Any flap, etc. that opens like a door.
▸ noun:  (immigration) An entry point.
▸ noun:  (figurative) A means of approach or access.
▸ noun:  (figurative) A possibility.
▸ noun:  (figurative) A barrier.
▸ noun:  (computing, dated) A software mechanism by which a user can interact with a program running remotely on a bulletin board system. See BBS door.
▸ noun:  The proceeds from entrance fees and/or ticket sales at a venue such as a bar or nightclub, especially in relation to portion paid to the entertainers.
▸ verb:  (transitive, cycling) To cause a collision by opening the door of a vehicle in front of an oncoming cyclist or pedestrian.

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