peek out(from behind someone or something)
1. to look outward from behind someone or something. A shy kitten peeked out from behind the sofa. I looked toward the back of the sofa just as a little cat face peeked out.
2. to show just a little bit with the rest concealed behind someone or something. A bit of yellow peeked out from behind the tree, so we knew Frank was hiding there. We saw a flash of Frank's yellow shirt peek out.
peek out(from underneath someone or something)
1. to look outward from beneath someone or something. A small furry face peeked out from underneath the sofa. At the base of the sofa, a cat peeked out.
2. to show just a little bit with the rest concealed under someone or something. Her petticoat peeked out from underneath her skirt. Her skirt was a tad too short and a little bit of her slip peeked out.