zerkniecie in inglese:

I saw her peeping through the curtains/into the room

The door was ajared and Helen peeped in.

. Don't peep! Keep your eyes closed or it'll ruin the surprise.

I thought I heard a peep.

One more peep and I'm gonna paste you right in the face!

She would have liked to peep in, but could not do such a thing.

If I hear one more peep out of you I'm sending you to your room without supper.