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

• hematochezia
• hematochrome
• hematocoele
• hematocolpometra
• hematocolpos
• hematocrit
• hematocyst
• hematocytopenia
• hematocyturia
• hematogenesis
• hematogenic
• hematohiston
• hematoidin
• hematologic
• hematological
• hematologist
• hematology
• hematolysis
• hematoma
• hematopoeitic stem cell
• hematopoiesis
• hematopoietic
• hematuria
• heme
• hemeralopia