piggyback (Noun) — The act of carrying something piggyback.
piggyback (Verb) — Ride on someone's shoulders or back.
piggyback (Verb) — Haul truck trailers loaded with commodities on railway cars.
piggyback (Verb) — Haul by railway car.
piggyback (Verb) — Support on the back and shoulders. ex. "He piggybacked her child so she could see the show"
piggyback (Verb) — Bring into alignment with. ex. "an amendment to piggyback the current law"
piggyback (Adverb) — On a railway flatcar. ex. "the trailer rode piggyback across the country"
piggyback (Adverb) — On the back, shoulder or astraddle on the hip. ex. "she carried her child piggyback"