"sies" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "en",
        "3": "chess"
      },
      "expansion": "English chess",
      "name": "bor"
    }
  ],
  "etymology_text": "Borrowed from English chess.",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "sies m (uncountable, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cy",
          "name": "Chess",
          "orig": "cy:Chess",
          "parents": [
            "Board games",
            "Tabletop games",
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "chess"
      ],
      "id": "en-sies-cy-noun-rHOdzNEh",
      "links": [
        [
          "chess",
          "chess#English"
        ]
      ],
      "synonyms": [
        {
          "word": "gwyddbwyll"
        }
      ],
      "tags": [
        "masculine",
        "not-mutable",
        "uncountable"
      ]
    }
  ],
  "word": "sies"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "en",
        "3": "chess"
      },
      "expansion": "English chess",
      "name": "bor"
    }
  ],
  "etymology_text": "Borrowed from English chess.",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "sies m (uncountable, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Welsh entries with incorrect language header",
        "Welsh entries with topic categories using raw markup",
        "Welsh lemmas",
        "Welsh masculine nouns",
        "Welsh non-mutable terms",
        "Welsh nouns",
        "Welsh terms borrowed from English",
        "Welsh terms derived from English",
        "Welsh uncountable nouns",
        "cy:Chess"
      ],
      "glosses": [
        "chess"
      ],
      "links": [
        [
          "chess",
          "chess#English"
        ]
      ],
      "tags": [
        "masculine",
        "not-mutable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "gwyddbwyll"
    }
  ],
  "word": "sies"
}