Definitions from Wiktionary (back door)

▸ noun:  A subsidiary entrance to a building or house at its rear, normally away from the street.
▸ noun:  A means of access, often secret and unprotected, to something.
▸ noun:  (computer security) A secret means of access to a program or system.
▸ noun:  (automotive) A rear side door of a car, or at the back of a van.
▸ noun:  (slang) The anus; (by extension) anal sex.
▸ noun:  (golf, informal) The rear side of the hole, furthest from the golfer.
▸ adjective:  (US, baseball) The path of a pitch which starts outside and then slides over the plate.
▸ adjective:  Achieved through indirect means.
▸ adjective:  (poker, of a draw) Requiring consecutive cards on the turn and river to be achieved.
▸ verb:  To attempt to accomplish by indirect means, especially when direct means are proscribed.
▸ verb:  (surfing) To enter a tube by accelerating from behind; to surf into an already formed hollow wave, in contrast to the normal method of slowing to allow a surfable wave to form.
▸ verb:  (computer security) To add a backdoor (a secret means of access) to a program or system.
▸ Also see back_door

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