It is stairs, which goes up - down but never moves.
What is stairs?
The term "stairs" means, one of a flight or series of steps for going from one level to another, as in a building.
What is moves?
The term "moves" means to change your position or go to a different place.
It is so, because stairs stay still but we use it for going up and coming down, for example- She is going downstairs.
He is going upstairs.
To know more about stairs here
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