"crack willow" meaning in English

{
  "forms": [
    {
      "form": "crack willows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "crack willow (plural crack willows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Willows and poplars",
          "orig": "en:Willows and poplars",
          "parents": [
            "Malpighiales order plants",
            "Trees",
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A of willow native to Europe and western Asia (Salix fragilis)."
      ],
      "id": "en-crack_willow-en-noun-wY~y4A5I",
      "links": [
        [
          "willow",
          "willow"
        ]
      ],
      "synonyms": [
        {
          "word": "brittle willow"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Salix fragilis",
          "word": "salava"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Salix fragilis",
          "tags": [
            "masculine"
          ],
          "word": "saule fragile"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "íva lómkaja",
          "sense": "Salix fragilis",
          "tags": [
            "feminine"
          ],
          "word": "и́ва ло́мкая"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "rakíta",
          "sense": "Salix fragilis",
          "tags": [
            "feminine"
          ],
          "word": "раки́та"
        }
      ]
    }
  ],
  "word": "crack willow"
}

{
  "forms": [
    {
      "form": "crack willows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "crack willow (plural crack willows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "Entries using missing taxonomic name (species)",
        "en:Willows and poplars"
      ],
      "glosses": [
        "A of willow native to Europe and western Asia (Salix fragilis)."
      ],
      "links": [
        [
          "willow",
          "willow"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "brittle willow"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Salix fragilis",
      "word": "salava"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Salix fragilis",
      "tags": [
        "masculine"
      ],
      "word": "saule fragile"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "íva lómkaja",
      "sense": "Salix fragilis",
      "tags": [
        "feminine"
      ],
      "word": "и́ва ло́мкая"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "rakíta",
      "sense": "Salix fragilis",
      "tags": [
        "feminine"
      ],
      "word": "раки́та"
    }
  ],
  "word": "crack willow"
}