Definition of Sneak

Verb: sneak (sneaked, also snuck) sneek

To go stealthily or furtively
"..stead of sneaking around spying on the neighbour's house";
- mouse, creep, pussyfoot
Put, bring, or take in a secretive or furtive manner
"sneak a look"; "sneak a cigarette"
Make off with belongings of others
- pilfer, cabbage, purloin, pinch [Brit], abstract, snarf [N. Amer], swipe, hook, filch [informal], nobble [Brit], lift, snatch, whip [Brit], nick [Brit, informal]
Pass on stealthily
"He sneaked me the key when nobody was looking";
- slip

Noun: sneak sneek

A person who is regarded as underhanded and furtive and contemptible
Someone who prowls or sneaks about; usually with unlawful intentions
- prowler, stalker
Someone acting as an informer or decoy for the police
- fink [N. Amer], snitch, snitcher, stoolpigeon, stool pigeon, stoolie [N. Amer], sneaker, canary [N. Amer], grass [Brit]

Adjective: sneak sneek

Marked by quiet and caution and secrecy; taking pains to avoid being observed
"a sneak attack";
- furtive, sneaky, stealthy, surreptitious