"exchanging of contracts" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "alt_of": [
        {
          "word": "exchange of contracts"
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      "glosses": [
        "Alternative form of exchange of contracts."
      ],
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  "word": "exchanging of contracts"
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  "lang_code": "en",
  "pos": "noun",
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      "alt_of": [
        {
          "word": "exchange of contracts"
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        "Alternative form of exchange of contracts."
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  "word": "exchanging of contracts"
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