"lichening" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "ref": "1892, William Makepeace Thackeray, The Cornhill Magazine, page 230:",
          "text": "The house was apparently very old; it had an almost prehistoric look about it, so rude and weatherbeaten was it, but the rudeness of the masonry and the lichening of the stones were no real indications of antiquity […]",
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      "glosses": [
        "A covering of lichen."
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          "lichen",
          "lichen"
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  "lang_code": "en",
  "pos": "noun",
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        "A covering of lichen."
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