As a teenager she would 'sneak' out (of her house/apartment) at night to visit her boyfriend.
I'm going to 'sneak' a smoke. [=I'm going to smoke a cigarette while nobody is watching]
She took a 'sneak peek' [=a secret look] at the birthday presents hidden in the closet.
(..) If promises were crackers, my daughter would be fat. I'm really sorry, Mr. Ditkovitch. All I got is this for the rest of the week. "Sorry" doesn't pay the rent. And don't try to sneak past me. I have ears like a cat and eyes like a rodent. Thanks, Mr. Ditkovitch. Hi, Pete. Hello? Rent? (..)2004 Spider-Man 2