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From Collins Dictionary:
Noun.
If you give someone a piggyback, you carry them high on your back, supporting them under their knees.
Intransitive Verb.
If you piggyback on something that someone else has thought of or done, you use it to your advantage.
IPA: pɪgibæk
"'Anybody who can piggyback-ride a Fury is okay by me.'" (Percy Jackson, p. 170)
My ankle was twisted, so Dorothy gave me a piggyback-ride up the hill.
Arezoo's idea was so good, I piggybacked from it to start my paper.
1823: originates from piggyback (adj.) which means "on the shoulders or back like a pack or bundle"
Which is itself an alternation of pickapack / pick pack (1560s) which means "on the back or shoulders like a pack"
By 1952, "to ride piggyback" (v.)
French: monter sur le dos de [qqn]
Spanish: Caballito, Cocochito
Polish: jazda na barana
Arabic: محمول على الظهر
Mandarin Chinese: 骑在某人背上玩
Korean: 어부바