"трѧсти" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Verbes en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Verbes imperfectifs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "třást"
    }
  ],
  "etymology_texts": [
    "Apparenté au latin terreō, tremō, au grec ancien τρέμω, τρόμος."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "verb",
  "pos_title": "Verbe",
  "senses": [
    {
      "glosses": [
        "Secouer."
      ],
      "id": "fr-трѧсти-cu-verb-gGAceL8A"
    }
  ],
  "tags": [
    "imperfective"
  ],
  "word": "трѧсти"
}

{
  "categories": [
    "Verbes en vieux slave",
    "Verbes imperfectifs en vieux slave",
    "vieux slave"
  ],
  "derived": [
    {
      "lang": "Tchèque",
      "lang_code": "cs",
      "word": "třást"
    }
  ],
  "etymology_texts": [
    "Apparenté au latin terreō, tremō, au grec ancien τρέμω, τρόμος."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "verb",
  "pos_title": "Verbe",
  "senses": [
    {
      "glosses": [
        "Secouer."
      ]
    }
  ],
  "tags": [
    "imperfective"
  ],
  "word": "трѧсти"
}