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English definition of “sneak”

sneak

noun [C]     /sniːk/ UK slang disapproving (US snitch)
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!People who reveal secrets and tell tales
(Definition of sneak noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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