"substâmes" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "nous substâmes"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "subster"
        }
      ],
      "glosses": [
        "Première personne du pluriel de l’indicatif passé simple du verbe subster."
      ],
      "id": "fr-substâmes-fr-verb-I2tOnjph"
    }
  ],
  "sounds": [
    {
      "ipa": "\\syb.stam\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "substâmes"
}

{
  "categories": [
    "Formes de verbes en français",
    "français"
  ],
  "forms": [
    {
      "form": "nous substâmes"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en français"
      ],
      "form_of": [
        {
          "word": "subster"
        }
      ],
      "glosses": [
        "Première personne du pluriel de l’indicatif passé simple du verbe subster."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\syb.stam\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "substâmes"
}