Meaning of “upstairs” - Learner’s Dictionary

upstairs

adverb uk us /ʌpˈsteəz/

A2 on or to a higher level of a building:

He ran upstairs to answer the phone.
The people who live upstairs are very noisy.
upstairs adjective

B1

an upstairs bedroom

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