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

 

walking

 adjective
adjective
BrE BrE//ˈwɔːkɪŋ//
 
; NAmE NAmE//ˈwɔːkɪŋ//
 
 
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[only before noun] (informal) used to describe a human or living example of the thing mentioned She's a walking dictionary (= she knows a lot of words). That boy's a walking disaster (= he is always having accidents).
See the Oxford Advanced American Dictionary entry: walking