Meaning of “stairs” - Learner’s Dictionary

stairs

noun [ plural ] us uk /steəz/
Extra Examples
She picked up the child and carried him down the stairs.Shall we use the stairs or take the lift?The lift was broken so we had to climb six flights of stairs.The children were constantly running up and down the stairs.He pounded up the stairs.

A2 a set of steps from one level in a building to another:

to go up/down the stairs
to climb the stairs
a flight (= set) of stairs

(Definition of “stairs” from the Cambridge Learner’s Dictionary © Cambridge University Press)