Moved quietly and secretly to avoid being noticed; past tense of 'sneak.'
From Middle English 'snike,' possibly from Scandinavian roots. Originally meant 'to sneak or creep,' and 'snuck' became the common past tense by the late 1800s, though 'sneaked' remains standard in formal writing.
Linguists love 'snuck' because it shows how language changes—it wasn't in dictionaries until recently because teachers and grammarians insisted 'sneaked' was 'correct,' but enough people used 'snuck' that it became standard anyway!
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