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dog-leg stair

or dog-legged stair

[dawg-leg, dog-]
noun
  1. a half-turn stair, the successive flights of which are immediately side by side and connected by an intervening platform.
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Origin of dog-leg stair

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018