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an unauthorized tapping into another's connection with a public utility
Clandestine use of a neighbor's wireless Internet connection is an increasingly prevalent example of piggybacking.
The transport of loaded containers or semitrailers on railroad flatcars (1953+)verb
To originate or prosper with the help of something else: Aerobic dancing piggybacked on the jogging craze (1968+)
[fr the term for carrying someone, esp a child, on one's back, derived by folk etymology fr pick-a-back, of unknown origin]