IPA: /ˈʌpˌstɛrz/
KK: /ˈʌpˌstɛrz/
Referring to a location that is on a higher floor of a building, typically above the ground level.
The children are playing in the upstairs room.
In a position or location that is higher than the ground level, often referring to a floor above the one you are currently on.
She went upstairs to get her book.
The area or rooms located on a floor above the ground level in a building.
She went upstairs to get her book.
Upstairs → It is formed from "up" (from Old English "upp", meaning higher or above) and "stairs" (from Old English "staer", meaning a step or stair). The word "upstairs" refers to the area or rooms located on a higher level of a building, above the ground floor.
Think of going 'higher' ('up') on 'steps' ('stairs') — that's what upstairs means.
No commonly confused words.