stair

support consisting of a place to rest the foot while ascending or descending a stairway; "he paused on the bottom step"

उनके पैरों में इतनी बुरी तरह से दर्द हो रहा था की एक भी सीढ़ी नहीं चढ़ सके|

His legs were paining so badly that he could not climb even one stair.