"-de" meaning in Swedish

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "suffix"
      },
      "expansion": "-de",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "att simma (“to swim”) + -de → simmade (“swam”)",
          "type": "example"
        },
        {
          "text": "att träffa (“to hit”) + -de → träffade (“hit (past)”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Creates the past tense of weak verbs in the first conjugation."
      ],
      "id": "en--de-sv-suffix-RB6hfVTk",
      "related": [
        {
          "word": "-te"
        },
        {
          "word": "-dde"
        },
        {
          "word": "-t"
        }
      ],
      "synonyms": [
        {
          "word": "-te"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-de"
}

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "suffix"
      },
      "expansion": "-de",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "suffix",
  "related": [
    {
      "word": "-te"
    },
    {
      "word": "-dde"
    },
    {
      "word": "-t"
    }
  ],
  "senses": [
    {
      "categories": [
        "Swedish entries with incorrect language header",
        "Swedish lemmas",
        "Swedish suffixes",
        "Swedish terms with usage examples"
      ],
      "examples": [
        {
          "text": "att simma (“to swim”) + -de → simmade (“swam”)",
          "type": "example"
        },
        {
          "text": "att träffa (“to hit”) + -de → träffade (“hit (past)”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Creates the past tense of weak verbs in the first conjugation."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "-te"
    }
  ],
  "word": "-de"
}