"worry stone" meaning in English

{
  "forms": [
    {
      "form": "worry stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "worry stone (plural worry stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A small, smooth polished stone or crystal designed for people to rub with their thumb to alleviate stress or anxiety."
      ],
      "id": "en-worry_stone-en-noun-hoB5pxSv",
      "synonyms": [
        {
          "word": "thumb stone"
        },
        {
          "word": "palm stone"
        },
        {
          "word": "fidget stone"
        },
        {
          "word": "comfort stone"
        },
        {
          "word": "soothing stone"
        }
      ],
      "wikipedia": [
        "worry stone"
      ]
    }
  ],
  "word": "worry stone"
}

{
  "forms": [
    {
      "form": "worry stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "worry stone (plural worry stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A small, smooth polished stone or crystal designed for people to rub with their thumb to alleviate stress or anxiety."
      ],
      "wikipedia": [
        "worry stone"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "thumb stone"
    },
    {
      "word": "palm stone"
    },
    {
      "word": "fidget stone"
    },
    {
      "word": "comfort stone"
    },
    {
      "word": "soothing stone"
    }
  ],
  "word": "worry stone"
}