a decorative paper for the walls of rooms
"She spent hours selecting floral wallpaper to brighten up her bedroom before painting the ceiling white."
Decorative paper-like material used to cover the inner walls of buildings.
"They spent the weekend peeling off the old floral wallpaper and hanging a fresh, modern pattern on the living room walls."
In plain English: Wallpaper is a decorative paper that people stick to their walls to make them look nicer.
"We need to buy some new wallpaper for the living room walls."
To cover (a wall, a room, etc) with wallpaper.
"She spent the weekend carefully applying floral patterns to the living room walls with new wallpaper."
In plain English: To wallpaper something means to cover its surface with paper patterns, though people now mostly use it as slang for setting an image as their phone or computer background.
"The old man wallpapered his living room with bright blue flowers before moving into the new house."
Usage: Use this verb to describe the act of applying paper decorations directly onto walls or ceilings as an interior design choice. It is distinct from painting because it involves adhering a specific patterned material rather than using liquid pigment.
The word is a straightforward combination of "wall" and "paper," describing material specifically designed to be pasted onto walls rather than used as ordinary writing sheets. It entered the English language in the mid-eighteenth century to distinguish this decorative covering from plain sheeting.