A small, light vehicle with runners, used recreationally, mostly by children, for sliding down snow-covered hills. (A "sled" in this sense is not pulled by an animal as a "sleigh" is.)

“The child zoomed down the hill on his sled.”

A vehicle on runners, used for conveying loads over the snow or ice. (contrast "sleigh", which is larger)

“"Mush!" he yelled at the dogs pulling the sled.”

A snowmobile.

To ride a sled.

To convey on a sled.