Etymology
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backstairs (n.)

"stairs at the back of a structure," 1650s, from back (adj.) + stairs (see stair). Figurative use is attested earlier (1640s).

updated on March 15, 2017

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Definitions of backstairs from WordNet
1
backstairs (n.)
a second staircase at the rear of a building;
2
backstairs (adj.)
secret and sly or sordid; "his low backstairs cunning"- A.L.Guerard;
backstairs gossip
backstairs intimacies
Synonyms: backstair / furtive
From wordnet.princeton.edu, not affiliated with etymonline.