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

• Bursera
• Bursera microphylla
• Bursera simaruba
• Burseraceae
• bursiform
• bursitis
• burst
• burst forth
• burst in on
• burst out
• burst upon
• burster
• bursting charge
• bursting explosive
• Burt
• burthen
• Burton
• Burundi
• Burundi franc
• Burundian
• burunduki
• burweed marsh elder
• bury
• bury the hatchet
• burying