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piggyback (adj.)

also piggy-back, "on the shoulders or back like a pack or bundle," 1823, probably a folk etymology alteration of colloquial pickapack, pick pack (1560s) "on the back or shoulders like a pack," which perhaps is from pick, a dialectal variant of pitch (v.1). As a verb, "to ride piggyback," by 1952.

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Definitions of piggyback
1
piggyback (v.)
ride on someone's shoulders or back;
piggyback (v.)
haul truck trailers loaded with commodities on railroad cars;
piggyback (v.)
haul by railroad car;
piggyback (v.)
support on the back and shoulders;
He piggybacked her child so she could see the show
piggyback (v.)
bring into alignment with;
an amendment to piggyback the current law
2
piggyback (adv.)
on a railroad flatcar;
the trailer rode piggyback across the country
Synonyms: pickaback / pig-a-back
piggyback (adv.)
on the back or shoulder or astraddle on the hip;
she carried her child piggyback
Synonyms: pickaback / pig-a-back
3
piggyback (n.)
the act of carrying something piggyback;
From wordnet.princeton.edu