[sneak] vb sneaked or snuck ; sneak.ing [akin to OE snican to sneak along, ON snikja] vi (1596) 1: to go stealthily or furtively: slink
2: to act in or as if in a furtive manner
3: to carry the football on a quarterback sneak ~ vt: to put, bring, or take in a furtive or artful manner "~ a smoke" syn see lurk -- sneak up on : to approach or act on stealthily usage From its earliest appearance in print in the late 19th century as a dialectal and prob. uneducated form, the past and past participle snuck has risen to the status of standard and to approximate equality with sneaked. Indications are that it is continuing to grow in frequency. It is most common in the U.S. and Canada, but has also been spotted in British and Australian English.
[2]sneak n (ca. 1643) 1: a person who acts in a stealthy, furtive, or shifty manner
2. a: a stealthy or furtive move b: an unobserved departure or escape
3: sneaker 2
4: quarterback sneak [3]sneak adj (ca. 1859) 1: carried on secretly: clandestine
2: occurring without warning: surprise "a ~ attack"