Slipcovering means putting a cover on furniture to protect it or make it look different.
Slipcovering can make furniture look nice and clean. It can also make furniture look new.
Examples:
I am slipcovering the sofa.
She is slipcovering the chair with a new cover.
They are slipcovering the old couch.
We are slipcovering our chairs with colorful fabric.
The slipcovering of the sofa made it look brand new.
He is slipcovering the whole room with fabric!