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.
(..) the Temple of the Dosh Khaleen. What are you doing? It's forbidden to carry weapons in the sacred city. Isn't it forbidden to sneak into their city and steal their khaleesi? If they spot us and we're unarmed, we'll say we're traders heading for the Western Market. But if they see weapons... (..)2016 TvShow: Game of Thrones Title: Book of the Stranger Season: 6 Episode 4