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Longman Dictionary of Contemporary English
back door
noun
EXAMPLES FROM OTHER ENTRIES
▪ The job can be a back door into the bank's training program.
EXAMPLES FROM CORPUS
▪ After midnight we tiptoed down the hallway and out the back door, without anybody seeing us.
▪ But as she reached the back door, the sound of a loud, angry voice stopped her in her tracks.
▪ He came in through the back door on Lily's afternoon out.
▪ Preston opened the back door and stared out into the garden.
▪ She said in the interview that she refused to open the back door when she heard him knock.
▪ Sills testified he heard some one banging on his back door and he found the three brothers had let themselves into the kitchen.
▪ Then he walked her through the back door as he always did and stood by until she was in her car.
The Collaborative International Dictionary
Back door

Back door \Back" door"\ A door in the back part of a building; hence, an indirect way.
--Atterbury.

Wiktionary
back door
  1. (context US baseball English) The path of a pitch which starts outside and then slides over the plate. alt. 1 A subsidiary entrance to a building or house at its rear, normally away from the street. 2 A means of access, often secret and unprotected, to something. 3 (context computing English) A secret means of access to a program or system. 4 (context slang English) The anus, generally used in reference to anal sex. n. 1 A subsidiary entrance to a building or house at its rear, normally away from the street. 2 A means of access, often secret and unprotected, to something. 3 (context computing English) A secret means of access to a program or system. 4 (context slang English) The anus, generally used in reference to anal sex. v

  2. 1 To attempt to accomplish by indirect means, especially when direct means are proscribed. 2 (context surfing English) 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.

WordNet
back door
  1. n. a secret or underhand means of access (to a place or a position); "he got his job through the back door"

  2. an entrance at the rear of a building [syn: back entrance]

Wikipedia
Back door

Back door may refer to:

  • A door in the rear of a house or other building
  • Backdoor (computing), a hidden method for bypassing normal computer authentication systems
  • Back Door (jazz trio), a British group
  • The Back Door (fiction), an 1897 work serialised in Hong Kong newspaper The China Mail
  • The Back Door (album), a 1992 album by American band Cherish the Ladies
  • Backdoor (basketball), a play in which a player gets behind the defense and receives a pass for an easy score
  • Backdoor Bay, Ross Island, Antarctica
Back Door (jazz trio)

Back Door was a jazz-rock trio, formed in 1971.

Back Door (album)

Back Door is the eponymously titled debut studio album of Back Door, released independently in 1972 by Blakey Records. It received wider distribution when it was adopted by Warner Bros. the following year. It introduced the group's virtuoso approach to jazz, funk, soul, blues and hard rock music. In 2005, the album was listed on JazzTimes' top fifty albums released between 1970 and 2005. In 2014 it was re-released on CD, compiled with 8th Street Nites and Another Fine Mess, by BGO Records.

Usage examples of "back door".

Here he turned swiftly down a narrow passage, passed through a wooden gate into a deserted yard, and then opened with a key the back door of a house.

Undoubtedly by the garden path and the back door, from which there is direct access to the study.

She opened the back door, and he smelled plants moist with dew, night-blooming jasmine, the faint tang of the ocean.

But before Jeremy was scanned, he did a lot of work on the command interpreter, and he left himself a back door.

Gary Ripton wasn't going to swing in through the back door tonight, asking what was for supper.