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

 

sprog

 noun
noun
BrE BrE//sprɒɡ//
 
; NAmE NAmE//sprɑːɡ//
 
(British English, informal, humorous)
 
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a child or baby Word Origin 1940s (originally services' slang referring to a military recruit or trainee): perhaps from obsolete sprag ‘lively young man’, of unknown origin.