"pickaback" in the adverb sense
1. piggyback, pickaback, pig-a-back
on a railroad flatcar
"the trailer rode piggyback across the country"
2. piggyback, pickaback, pig-a-back
on the back or shoulder or astraddle on the hip
"she carried her child piggyback"
Source: WordNet® (An amazing lexical database of English)
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