a short narrow board with two small wheels fixed to the bottom of either end, on which a person can ride in a standing or crouching position, propelling themselves by occasionally pushing one foot against the ground.
[no object] (often as noun skateboarding)
ride on a skateboard:an ordinance to prohibit skateboardingteenagers in Day-Glo shorts skateboard home from an evening out
skateboard in other Oxford dictionaries
Definition of skateboard in the US English dictionary