"fussé" meaning in French

{
  "forms": [
    {
      "form": "fussè",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "verb form"
      },
      "expansion": "fussé",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "I will not deny my principles, even if I alone defend them.",
          "text": "Je ne renierai point mes principes, fussé-je le seul à les défendre.",
          "type": "example"
        }
      ],
      "glosses": [
        "presubject first-person singular imperfect subjunctive of être"
      ],
      "id": "en-fussé-fr-verb-zU4HdawL",
      "links": [
        [
          "presubject",
          "presubject"
        ],
        [
          "être",
          "être#French"
        ]
      ]
    }
  ],
  "word": "fussé"
}

{
  "forms": [
    {
      "form": "fussè",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "verb form"
      },
      "expansion": "fussé",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French non-lemma forms",
        "French terms with usage examples",
        "French verb forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "I will not deny my principles, even if I alone defend them.",
          "text": "Je ne renierai point mes principes, fussé-je le seul à les défendre.",
          "type": "example"
        }
      ],
      "glosses": [
        "presubject first-person singular imperfect subjunctive of être"
      ],
      "links": [
        [
          "presubject",
          "presubject"
        ],
        [
          "être",
          "être#French"
        ]
      ]
    }
  ],
  "word": "fussé"
}