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

 

muso

 noun
noun
BrE BrE//ˈmjuːzəʊ//
 
; NAmE NAmE//ˈmjuːzoʊ//
 
(pl. musos)(British English, informal)
 
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a person who plays, or is very interested in, music and knows a lot about it Word Origin 1960s: abbreviation.