"σύστησα" meaning in Greek

{
  "forms": [
    {
      "form": "sýstisa",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "verb form",
        "head": "",
        "sort": ""
      },
      "expansion": "σύστησα • (sýstisa)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "σύστησα • (sýstisa)",
      "name": "el-verb-form"
    }
  ],
  "hyphenation": [
    "σύ‧στη‧σα"
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "systíno",
          "word": "συστήνω"
        }
      ],
      "glosses": [
        "1st person singular simple past form of συστήνω (systíno)."
      ],
      "id": "en-σύστησα-el-verb-2D7Uc354",
      "links": [
        [
          "simple past",
          "simple past"
        ],
        [
          "συστήνω",
          "συστήνω#Greek"
        ]
      ],
      "tags": [
        "first-person",
        "form-of",
        "past",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsi.sti.sa/"
    }
  ],
  "word": "σύστησα"
}

{
  "forms": [
    {
      "form": "sýstisa",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "verb form",
        "head": "",
        "sort": ""
      },
      "expansion": "σύστησα • (sýstisa)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "σύστησα • (sýstisa)",
      "name": "el-verb-form"
    }
  ],
  "hyphenation": [
    "σύ‧στη‧σα"
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Greek entries with incorrect language header",
        "Greek non-lemma forms",
        "Greek terms with IPA pronunciation",
        "Greek verb forms",
        "Greek verb past tense forms"
      ],
      "form_of": [
        {
          "extra": "systíno",
          "word": "συστήνω"
        }
      ],
      "glosses": [
        "1st person singular simple past form of συστήνω (systíno)."
      ],
      "links": [
        [
          "simple past",
          "simple past"
        ],
        [
          "συστήνω",
          "συστήνω#Greek"
        ]
      ],
      "tags": [
        "first-person",
        "form-of",
        "past",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsi.sti.sa/"
    }
  ],
  "word": "σύστησα"
}