"tesko" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "desko",
      "tags": [
        "unmutated"
      ]
    },
    {
      "form": "zesko",
      "tags": [
        "mutation-soft"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en breton",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Yann ar Flocʼh, Koñchennou eus Bro ar Ster Aon, Kemper, 1950, page 132",
          "text": "« M’ ho tesko, » emezi, « d’ am dispriza ! »",
          "translation": "« Moi je vous apprendrai, » dit-elle, « à me mépriser ! »"
        }
      ],
      "form_of": [
        {
          "word": "desko"
        }
      ],
      "glosses": [
        "Forme mutée de desko par durcissement (d > t)."
      ],
      "id": "fr-tesko-br-verb-txYZk6cZ"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈtes.ko\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "tesko"
}

{
  "categories": [
    "Formes de verbes en breton",
    "breton"
  ],
  "forms": [
    {
      "form": "desko",
      "tags": [
        "unmutated"
      ]
    },
    {
      "form": "zesko",
      "tags": [
        "mutation-soft"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "categories": [
        "Exemples en breton"
      ],
      "examples": [
        {
          "ref": "Yann ar Flocʼh, Koñchennou eus Bro ar Ster Aon, Kemper, 1950, page 132",
          "text": "« M’ ho tesko, » emezi, « d’ am dispriza ! »",
          "translation": "« Moi je vous apprendrai, » dit-elle, « à me mépriser ! »"
        }
      ],
      "form_of": [
        {
          "word": "desko"
        }
      ],
      "glosses": [
        "Forme mutée de desko par durcissement (d > t)."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈtes.ko\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "tesko"
}