"to-and-fros" meaning in English

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  "lang_code": "en",
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          "ref": "1875, E. Holland, Health in the nursery and how to feed and clothe a child with observations ..., page 41:",
          "text": "When you swing a child move it in short to-and-fros at first, and do not indulge in any high or rapid swings until the child is well used to the movement, ...",
          "type": "quote"
        },
        {
          "ref": "2009, Derek Bickerton, Adam's Tongue: How Humans Made Language, How Language Made Humans, page 32:",
          "text": "It's fascinating to watch these cyclic to-and-fros in science, like the rise and fall of hemlines, but more stimulating, intellectually at least.",
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          "word": "to and fros"
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        "form-of",
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  "word": "to-and-fros"
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  "lang_code": "en",
  "pos": "noun",
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        },
        {
          "ref": "2009, Derek Bickerton, Adam's Tongue: How Humans Made Language, How Language Made Humans, page 32:",
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