To ice-skate is to move over ice on special boots with a thin metal blade on the bottom — those boots are ice skates. You slide rather than walk. People ice-skate for fun on a frozen lake or at an ice rink, and some people race or dance on the ice. The verb is written ice-skate or ice skate (two words). In everyday talk, many people just say skate when it is already clear they mean on ice, not on a skateboard. This is a normal action word, not formal. Though actually, ice-skate as a noun can also mean the boot itself; here we are talking about the action: what you do when you wear them.

溜冰（動詞）。台灣日常說「溜冰」；中國大陸較常說「滑冰」。