Upstairs
Definition 1 of 3
Pro Tip 1/3
Sound Direction
Use 'upstairs' to indicate the source of sounds coming from a higher floor. Do you hear that music? It's coming from upstairs.
Pro Tip 2/3
Physical Movement
'Upstairs' implies physical movement towards a higher level inside buildings. Could you go upstairs and get my glasses?
Pro Tip 3/3
Location Context
Specify 'upstairs' when directing someone to a location above the first floor. The meeting room? It's upstairs, on the left.