pickaback
1. [ adverb ] on a railroad flatcar
Synonyms: pig-a-back piggyback
Examples:

"the trailer rode piggyback across the country"

2. [ adverb ] on the back or shoulder or astraddle on the hip
Synonyms: pig-a-back piggyback
Examples:

"she carried her child piggyback"

Similar spelling:   piggyback
  pig-a-back
  pickpocket