building material used in laying floors
"The contractor installed oak flooring to cover the entire living room."
A floor.
"The old hardwood flooring was replaced with new tile to improve the room's durability."
present participle of floor
"The exhausted runner was flooring as he sprinted toward the finish line."
In plain English: To floor someone means to completely shock or stun them so much that they are left speechless.
"The installer will be flooring our entire living room with hardwood tomorrow."
The word flooring comes from Middle English floring, which was a variation of the verb to floor meaning to cover with boards or tiles. It entered modern usage as a noun describing the surface material laid on top of a building's foundation.