stair
noun uk/steər/ us/ster/
stairs[ plural ]A2 楼梯
a set of steps that lead from one level of a building to another
Go up the stairs and her office is on the right. 上楼后，她的办公室在右手边。
I had to climb a steep flight (= set) of stairs to her front door. 我只得爬一段很陡的楼梯才到了她的前门。
He stood at the foot (= bottom) of the stairs and called out, "Breakfast's ready!" 他站在楼梯下喊道：“吃早饭了！”
[ C ]（楼梯的）梯级
one of the steps in a set of steps that lead from one level of a building to another
The top stair creaked as she went upstairs and the noise woke up her mother. 她上楼时最上面一级楼梯咯吱一响，吵醒了她母亲。
[ S ] old use or literary楼梯
a set of stairs
He climbed the wooden stair and knocked on his grandfather's door. 他爬上木楼梯，敲了敲祖父的房门。
Idiom
below/above stairsidiom UK old use 仆人／主人的住处
In a large house, below stairs was the part of the house in which the servants worked and lived, and above stairs was the part in which the family of the owner of the house lived.