"piggybacking" meaning in English

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      "expansion": "piggybacking",
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  "lang_code": "en",
  "pos": "verb",
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          "word": "piggyback"
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        "present participle and gerund of piggyback"
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  "etymology_text": "From piggyback + -ing.",
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  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "1960 November, David Morgan, “\"Piggyback\"—U.S. success story”, in Trains Illustrated, page 684",
          "text": "Throughout piggybacking's growth the railroads have demonstrated in all areas of the U.S. an ability to equal or exceed highway schedules.",
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        "The practice of carrying something piggyback."
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  "etymology_text": "From piggyback + -ing.",
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          "ref": "1960 November, David Morgan, “\"Piggyback\"—U.S. success story”, in Trains Illustrated, page 684",
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