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English definition of “sneak”

sneak

verb uk   /sniːk/ (sneaked or US also snuck, sneaked or US also snuck) us  

sneak verb (MOVE SECRETLY)

C2 [I or T, usually + adv/prep] to go somewhere secretly, or to take someone or something somewhere secretly: I managed to sneak in through the back door while she wasn't looking. Jan hasn't got a ticket but I thought we might sneak her in. I thought I'd sneak up on him (= move close to him without him seeing) and give him a surprise.

sneak verb (TELL SECRETLY)

[I] UK slang disapproving to secretly tell someone in authority, especially a teacher, that someone else has done something bad, often in order to cause trouble: She was always sneaking on other kids in the class.

sneak verb (LOOK)

sneak a look/glance at sb/sth C2 to look at someone or something quickly and secretly: I noticed him sneak a look at what I was writing.

sneak

noun [C] uk   /sniːk/ UK slang disapproving (US snitch) us  
a person who tells people in authority when someone else does something bad: You told Mrs Cooper that it was me who tipped the paint over, didn't you - you nasty little sneak!
(Definition of sneak from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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