English

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

 

sneak

 adjective
adjective
BrE BrE//sniːk//
 
; NAmE NAmE//sniːk//
 
 
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[only before noun] done without any warning a sneak attack Word Origin late 16th cent.: probably dialect; perhaps related to obsolete snike ‘to creep’.
See the Oxford Advanced American Dictionary entry: sneak