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back burner
back catalog
back channel
back concession
back copy
back country
back crawl
back dive
back door
back down
back emf
back emission
back end
back end load
back-formation
back forty
back four
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back door

back door (plural back doors)


noun 
Definition:
 
1. rear door: a door or entrance at the rear of a building

2. dishonest advantage: underhand or indirect access that gives somebody an unfair advantage

3. comput deliberate gap in security system: an opening deliberately left in a security system to allow access for technicians

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