Definition of sneak noun from the Oxford Advanced Learner's Dictionary



BrE BrE//sniːk//
; NAmE NAmE//sniːk//
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(old-fashioned, disapproving) a person, especially a child, who tells somebody about something wrong that another person has done synonym snitch Word Originlate 16th cent.: probably dialect; perhaps related to obsolete snike ‘to creep’.
See the Oxford Advanced American Dictionary entry: sneak