Skateboard (noun)

1. A flat board with four wheels attached, used for riding on surfaces such as pavement or concrete by standing on the board and propelling oneself with the feet.
2. A flat board with four wheels attached, used for riding on surfaces such as pavement or concrete.

Origin:

1940s: from skate + board.

Examples:

1. He rode his skateboard to school.
2. The skateboard was his favorite mode of transportation.
3. He was an expert at skateboarding.
4. The kids were playing with their skateboards in the park.
5. He bought a new skateboard for his birthday.