adverb, adjective
piggyback ( defs 1, 2 ).

1555–65; earlier a pickback; see pick1, back1

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World English Dictionary
pickaback (ˈpɪkəˌbæk)
n, —adv, —adj, —vb
another word for piggyback

piggyback or pickaback (ˈpɪɡɪˌbæk)
1.  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
3.  on the back and shoulders of another person
4.  on or as an addition to something else
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
vb (often foll by on)
7.  to give (a person) a piggyback on one's back and shoulders
8.  to transport (one vehicle) on another
9.  to exploit an existing resource, system, or product
10.  (tr) to attach to or mount on (an existing piece of equipment or system)
pickaback or pickaback

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