American English

Definition of walking adjective from the Oxford Advanced American Dictionary

 

walking

 adjective
adjective
NAmE//ˈwɔkɪŋ//
 
[only before noun] (informal)
 
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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 Learner's Dictionary entry: walking