piggyback piggyback /ˈpɪgiːˌbæk/

adverb

1. On the back, shoulder or astraddle on the hip  ( pickaback , pig-a-back , piggyback )
   on the back, shoulder or astraddle on the hip
    She carried her child piggyback
   she carried her child piggyback
   
2. On a railroad flatcar  ( pickaback , pig-a-back , piggyback )
   on a railroad flatcar
    The trailer rode piggyback across the country
   the trailer rode piggyback across the country
   

noun

1. The act of carrying something piggyback  ( piggyback )
   the act of carrying something piggyback
   

verb

1. Bring into alignment with  ( piggyback )
   bring into alignment with
    An amendment to piggyback the current law
   an amendment to piggyback the current law
   
2. Support on the back and shoulders  ( piggyback )
   support on the back and shoulders
    He piggybacked her child so she could see the show
   He piggybacked her child so she could see the show
   
3. Haul by railroad car  ( piggyback )
   haul by railroad car
   
4. Haul truck trailers loaded with commodities on railroad cars  ( piggyback )
   haul truck trailers loaded with commodities on railroad cars
   
5. Ride on someone's shoulders or back  ( piggyback )
   ride on someone's shoulders or back