piggyback

[pig-ee-bak]
adverb
1.
on the back or shoulders: The little girl rode piggyback on her father.
adjective
2.
astride the back or shoulders: a piggyback ride.
3.
sharing commercial time, space, etc.: piggyback advertising.
4.
carryable or attachable: a piggyback turbine unit.
5.
added or tacked on; supplementary: a piggyback clause.
6.
noting or pertaining to the carrying of one vehicle or the like by another, as the carrying of loaded truck trailers on flatcars.
verb (used with object)
7.
to attach or ally to as or as if a part of the same thing: to piggyback human rights agreements with foreign aid.
8.
to carry (somebody) on the back or shoulders.
9.
to carry (truck trailers) by railroad on flatcars.
10.
Radio and Television Slang. to advertise (two or more products) in the same commercial.
verb (used without object)
11.
to be transported aboard or atop another carrier: The space shuttle piggybacked on the airplane.
12.
to use, appropriate, or exploit the availability, services, or facilities of another: private clinics piggybacking on federal health-care facilities.
13.
to carry truck trailers by railroad on flatcars.
noun
14.
a house trailer designed to fit over a pickup truck.
15.
a truck trailer carried on a flatcar.
16.
anything that operates in connection with or as part of another.
Also, pickaback (for defs 1, 2).


Origin:
1580–90; alteration of pickaback

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
piggyback or pickaback (ˈpɪɡɪˌbæk)
 
n
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
 
adv
3.  on the back and shoulders of another person
4.  on or as an addition to something else
 
adj
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
 
n
 
adv
 
adj
 
vb

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

piggyback
1838, probably a folk-etymology alteration of pick pack (1565), which perhaps is from pick, a dial. variant of pitch (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They wondered if they might be able to piggyback on this system to deliver
  drugs to tumours-and they found that they could.
Modern high-tech clusters often gather round prestigious universities on whose
  research they can piggyback.
Another is to piggyback on excellence elsewhere in the university.
Allow power grid and telecommunication links to piggyback the corridor and help
  underwrite costs.
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