IPA: /ʌpˈstɛə/
KK: /ʌpˈstɛr/
Relating to or located on a higher floor of a building.
The bedroom is upstairs, while the living room is on the ground floor.
Upstair → The word is formed from "up" (meaning higher or above) and "stair" (from Old English *staer*, meaning a step or series of steps). The term "upstair" refers to a location that is higher up on a staircase or in a building.
Think of going 'up' to a 'higher' level on the 'stairs' — that's what upstair means.