a ride on the back and shoulders of another person
2.
a system whereby a vehicle, aircraft, etc, is transported for part of its journey on another vehicle, such as a flat railway wagon, another aircraft, etc
adverb
3.
on the back and shoulders of another person
4.
on or as an addition to something else
adjective
5.
of or for a piggyback: a piggyback ride, piggyback lorry trains
6.
of or relating to a type of heart transplant in which the transplanted heart functions in conjunction with the patient's own heart
verb (transitive)
7.
to give (a person) a piggyback on one's back and shoulders
8.
to transport (one vehicle) on another
9.
(intransitive) often foll by on. to exploit an existing resource, system, or product
10.
(transitive) to attach to or mount on (an existing piece of equipment or system)