witches' stairs
English
Etymology
From the suggestion that witches were unable to climb them.
Noun
witches
'
stairs
pl
(
plural only
)
steep staircase with alternate half treads.
References
https://www.apartmenttherapy.com/witches-stairs-36992297
https://www.reuters.com/article/factcheck-witches-stairs/fact-check-alternating-tread-stairs-were-not-historically-built-to-ward-off-witches-idUSL1N2L71QA