peek under (something)
1. To peer, glimpse, or glance under (something) quickly, shyly, or inconspicuously. I peeked under the rug to see if my toddler had hidden anything there. Sarah was peeking under the curtains trying to find our cat.
2. To be revealed partially from underneath something. I hate the way my shirt peeks under my jacket like that! I tried to cover up the graffiti with black paint, but there was still a bit of color peeking under it.
peek under something
to sneak a little glance beneath something. I peeked under the table, hoping to see the dog waiting therefor the part of my dinner I wasn't going to eat. Peek under the chair and see if the cat is there.