Sneak (verb)

1. Move quietly, stealthily or unobtrusively.
2. Do something or go somewhere stealthily, secretly or unobtrusively.
3. Obtain or enter somewhere in a stealthy manner.
4. Obtain or gain something in a stealthy, surreptitious or illicit manner.
5. Act in a stealthy, deceitful or treacherous manner.

Origin:

Middle english: of scandinavian origin; related to swedish snika "creep, slip" and norwegian snekka "move quietly".

Examples:

1. She sneaked out of the room without being noticed.
2. He sneaked a look at the answers.
3. The thief sneaked into the house through the window.
4. They sneaked a few bottles of wine into the park.
5. She sneaked a kiss while no one was looking.