Read the dictionary definition of sneak. All definitions for this word.
1. someone acting as an informer or decoy for the police
2. someone who prowls or sneaks about; usually with unlawful intentions
3. a person who is regarded as underhanded and furtive and contemptible
4. to go stealthily or furtively
1. ..stead of sneaking around spying on the neighbor's house
5. pass on stealthily
1. He slipped me the key when nobody was looking
6. make off with belongings of others
7. put, bring, or take in a secretive or furtive manner
1. sneak a look
2. sneak a cigarette
8. marked by quiet and caution and secrecy; taking pains to avoid being observed
1. a furtive manner
2. a sneak attack
3. stealthy footsteps
4. a surreptitious glance at his watch