Dictionary definition · sneak
noun
- a person who is regarded as underhanded and furtive and contemptible
- someone who prowls or sneaks about; usually with unlawful intentions
- someone acting as an informer or decoy for the police
verb
- to go stealthily or furtively"… stead of sneaking around spying on the neighbor's house"
- put, bring, or take in a secretive or furtive manner"sneak a look"
- make off with belongings of others
- pass on stealthily"He slipped me the key when nobody was looking"
adjective
- marked by quiet and caution and secrecy; taking pains to avoid being observed"a furtive manner"
Source: Open English WordNet (CC BY 4.0).