peep over (something)
1. To glance or peer shyly, quickly, or inconspicuously over the top of something. We peeped over the fence when we heard the neighbors start fighting. I caught the child peeping over the top of the sofa to see what was going on.
2. To be revealed partially above the top of something. All I could see was the man's head peeping over the top of the wall. Your underpants are peeping over the top of your jeans, Tom.
peep over something
to raise up and sneak a glance over some barrier; to look over the top of something. The child peeped over the wall to get a look at the yard next door. Grandfather peeped over his glasses to look at the television set for a moment.