To glide is to sail or skate with ease across a surface. Your favorite thing about winter might be watching the skaters in the park glide silently on the ice-covered lake.
A sled glides down a snowy hill, and a kayak glides across a silvery pond. Another way to glide is to soar in the air: your paper airplane, if you make it the right way, will glide all the way across the room, and a hawk can glide through the sky without seeming to move its wings. A different kind of glide is linguistic, a sound that's pronounced like a vowel but functions as a consonant.