(1) On a railroad flatcar
(2) On the back or shoulder or astraddle on the hip
(1) Especially droll was the situation of the huge fat Captain S., who, puffing and smiling good-naturedly, with legs dragging on the ground, rode pickaback on the feeble little Lieutenant O.
(2) Would you mind giving her a pickaback?
(3) In contrast, it is preferable that an infant should be held in a pickaback ride or a vertical manner when the head of the infant is set and the body of the infant becomes bigger.
(4) I climbed up from behind upon him, so he bore me pickaback
piggyback