"terrassaient" meaning in Français

{
  "anagrams": [
    {
      "word": "renitratasse"
    },
    {
      "word": "rentasserait"
    },
    {
      "word": "retartinasse"
    },
    {
      "word": "transatières"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "ils/elles terrassaient"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "terrasser"
        }
      ],
      "glosses": [
        "Troisième personne du pluriel de l’imparfait de l’indicatif de terrasser."
      ],
      "id": "fr-terrassaient-fr-verb-VwfxV7UX"
    }
  ],
  "sounds": [
    {
      "ipa": "\\tɛ.ʁa.sɛ\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "terrassaient"
}

{
  "anagrams": [
    {
      "word": "renitratasse"
    },
    {
      "word": "rentasserait"
    },
    {
      "word": "retartinasse"
    },
    {
      "word": "transatières"
    }
  ],
  "categories": [
    "Formes de verbes en français",
    "français"
  ],
  "forms": [
    {
      "form": "ils/elles terrassaient"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "terrasser"
        }
      ],
      "glosses": [
        "Troisième personne du pluriel de l’imparfait de l’indicatif de terrasser."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\tɛ.ʁa.sɛ\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "terrassaient"
}