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

• card index
• card player
• card reader
• card shark
• card table
• card trick
• card-carrying
• card-playing
• Cardamine
• Cardamine bulbifera
• Cardamine bulbosa
• Cardamine diphylla
• Cardamine douglasii
• Cardamine pratensis
• Cardamine rotundifolia
• cardamom
• cardamon
• cardamum
• cardboard
• cardboard city
• cardcase
• cardcastle
• carder
• cardholder
• cardhouse