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

 

sleepwalker

 noun
noun
BrE BrE//ˈsliːpwɔːkə(r)//
 
; NAmE NAmE//ˈsliːpwɔːkər//
 
(formal somnambulist)
 
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a person who walks around while they are asleep