Her slip 'peeked out' from beneath her skirt. [=a small part of her slip could be seen beneath her skirt]
We saw a 'sneak peek' [=a brief showing] of the movie that will be released next month.
They tried to 'sneak a peek' at the actors getting ready behind the curtain.
(..) There is nothing to fear... ...but fear itself! I am here to help you! Batman will save us. He'll come. - He'll come. - Don't peek. This is Gordon. Prepare to lower the bridge. I told you he'd come. RACHEL: Wait. (..)2005 Batman Begins