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

 

piggyback

 noun
noun
BrE BrE//ˈpɪɡibæk//
 
; NAmE NAmE//ˈpɪɡibæk//
 
 
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a ride on somebody’s back, while he or she is walking Give me a piggyback, Daddy! a piggyback ride Word Origin mid 16th cent. (as an adverb): the word's origins are uncertain.
See the Oxford Advanced American Dictionary entry: piggyback