English

Definition of billy-o noun from the Oxford Advanced Learner's Dictionary

 

billy-o

 noun
noun
BrE BrE//ˈbɪliəʊ//
 
; NAmE NAmE//ˈbɪli//
 
 
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Word Origin late 19th cent.: of unknown origin.Idioms
like billy-o
 
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(British English, informal) very hard or fast I ran like billy-o.