piggyback

the act of carrying something piggyback

ride on someone's shoulders or back

haul truck trailers loaded with commodities on railroad cars

haul by railroad car

support on the back and shoulders; "He piggybacked her child so she could see the show"

bring into alignment with; "an amendment to piggyback the current law"

on a railroad flatcar; "the trailer rode piggyback across the country"

on the back or shoulder or astraddle on the hip; "she carried her child piggyback"