a type of surfboard (= a board for riding on waves) that is lighter and shorter than the usual type

Younger surfers tend to favour shortboards that are good for fancy manoeuvres. 年轻的冲浪者倾向于喜欢适合花哨动作的短板。

For many years Medewi has had something of a cult following amongst longboarders and more senior shortboard surfers. 多年来，梅德维在长板选手和资深短板冲浪运动员中有一些狂热的追随者。

to ride on waves on a surfboard that is lighter and shorter than the usual type

I love to shortboard, but I also enjoy longboarding. 我喜欢短板冲浪，但我也喜欢长板冲浪。

I thought it would be fun to learn to shortboard this summer. 我认为今年夏天学习短板冲浪会很有趣。