"cow's grease" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "alt_of": [
        {
          "extra": "butter",
          "word": "cow grease"
        }
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          "ref": "1911, Truman Orville Douglass, The Pilgrims of Iowa, page 26:",
          "text": "Large companies of them often passed to Burlington from their camping ground a little west of us, and would stop for something to eat, asking first for doughnuts and cow's grease (butter).",
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      "glosses": [
        "Alternative form of cow grease (“butter”)"
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        "(slang) Alternative form of cow grease (“butter”)"
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  "word": "cow's grease"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
      "alt_of": [
        {
          "extra": "butter",
          "word": "cow grease"
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        "(slang) Alternative form of cow grease (“butter”)"
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  "word": "cow's grease"
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