To provide a surface with a floor or flooring. They decided to floor the entire house with hardwood.
To knock someone to the ground, especially in a fight or competition. The boxer floored his opponent with a powerful right hook.
To surprise or shock someone greatly. The unexpected news floored everyone in the room.
To press the accelerator of a vehicle to the floor, causing it to go as fast as possible. He floored the gas pedal to overtake the slow-moving truck.
Mathematics: to round (a real number) down to the nearest integer. When you floor 7.8, the result is 7.