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English definition of “creep up on/behind sb”

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creep up on/behind sb

verb [I usually + adv/prep] uk phrasal verb with creep   /kriːp/ (crept, crept) us  
to surprise someone and move closer to them without being seen or heard: Don't creep up on me like that! We crept up behind her and yelled "Boo!"
(Definition of creep up on/behind sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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