1. On a railway flatcar
   - piggyback, pig-a-back 
2. On the back or shoulder or astraddle on the hip
   - piggyback, pig-a-back

Encyclopedia: Pickaback

• Ca
• ca-ca
• Caaba
• cab
• cab fare
• cabal
• cabala
• cabalism
• cabalist
• cabalistic
• caballero
• cabana
• cabaret
• cabasset
• cabassous
• Cabassous unicinctus
• cabbage
• cabbage bark
• cabbage butterfly
• cabbage palm
• cabbage palmetto
• cabbage tree
• cabbage-bark tree
• cabbageworm
• cabbala