From Longman Dictionary of Contemporary Englishldoce_259_bpiggybackpig‧gy‧back1 /ˈpɪɡibæk/ (also piggyback ride) noun [countable] 
CARRYif you give someone, especially a child, a piggyback, you carry them high on your shoulders, supporting them with your hands under their legs —piggyback adverb
CARRYif you give someone, especially a child, a piggyback, you carry them high on your shoulders, supporting them with your hands under their legs —piggyback adverbExamples from the Corpus
piggyback• More than 70 percent of the females at the lake reach the water with a male already riding piggyback.• I had been dreaming of Cymbeline riding piggyback on my shoulders.piggybackpiggyback2 verb [intransitive] informal 1 USE/CONSUMEto use something that is bigger, better, or more successful in order to help another product or project succeedpiggyback on/onto videos that piggyback onto the success of proven TV programs2 to use someone else’s wi-fi connection to the Internet, without their knowledge or permissionpiggyback on/onto How can I prevent other people from piggybacking onto my connection? —piggybacking noun [uncountable]→ See Verb tableExamples from the Corpus
piggyback on/onto• Others piggyback on existing brands by borrowing parts of their names.• I had been dreaming of Cymbeline riding piggyback on my shoulders.• These new firms are piggybacking onto technology that we developed.From Longman Business Dictionarypiggybackpig‧gy‧back /ˈpɪgibæk/ verb1[intransitive, transitive] to use a situation that already exists in order to do or get what you wantpiggyback on/ontoSome pharmaceutical companies piggyback on existing brands by borrowing parts of their names.It wants to piggyback its order onto another city’s contract to keep costs down.2[transitive]TRANSPORT to move goods from one place to another, using containers that can be carried both by train and by road→ See Verb table 