sneak

sense 1: to go stealthily or furtively; "..stead of sneaking around spying on the neighbor's house"
sneak mouse creep steal pussyfoot

sense 2: put, bring, or take in a secretive or furtive manner; "sneak a look"; "sneak a cigarette"
sneak

sense 3: make off with belongings of others
pilfer cabbage purloin pinch abstract snarf swipe hook sneak filch nobble lift

sense 4: pass on stealthily; "He slipped me the key when nobody was looking"
slip sneak