"hacky sack" meaning in English

{
  "etymology_text": "A trademark of Wham-O. It uses reduplication of the word sack with the word hacky; a \"hack\", in the game's terminology, is akin to a point, and happens when every player in a group successfully passes the footbag.",
  "forms": [
    {
      "form": "hacky sacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "hacky sack (countable and uncountable, plural hacky sacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Games",
          "orig": "en:Games",
          "parents": [
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "90 10",
          "kind": "other",
          "name": "English genericized trademarks",
          "parents": [
            "Genericized trademarks",
            "Terms by etymology",
            "Trademarks",
            "Terms by usage"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "English reduplications",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "94 6",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "95 5",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "topical",
          "langcode": "en",
          "name": "Sports",
          "orig": "en:Sports",
          "parents": [
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet."
      ],
      "id": "en-hacky_sack-en-noun--tRJhekY",
      "links": [
        [
          "games",
          "game#Noun"
        ],
        [
          "game",
          "game"
        ],
        [
          "activity",
          "activity"
        ],
        [
          "footbag",
          "footbag"
        ],
        [
          "feet",
          "foot"
        ]
      ],
      "raw_glosses": [
        "(uncountable, games) A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "games"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "The footbag used for such a game."
      ],
      "id": "en-hacky_sack-en-noun-aDI5uvkN",
      "raw_glosses": [
        "(countable) The footbag used for such a game."
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "wikipedia": [
    "Wham-O",
    "hacky sack"
  ],
  "word": "hacky sack"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English genericized trademarks",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English reduplications",
    "English uncountable nouns",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Sports"
  ],
  "etymology_text": "A trademark of Wham-O. It uses reduplication of the word sack with the word hacky; a \"hack\", in the game's terminology, is akin to a point, and happens when every player in a group successfully passes the footbag.",
  "forms": [
    {
      "form": "hacky sacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "hacky sack (countable and uncountable, plural hacky sacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English uncountable nouns",
        "en:Games"
      ],
      "glosses": [
        "A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet."
      ],
      "links": [
        [
          "games",
          "game#Noun"
        ],
        [
          "game",
          "game"
        ],
        [
          "activity",
          "activity"
        ],
        [
          "footbag",
          "footbag"
        ],
        [
          "feet",
          "foot"
        ]
      ],
      "raw_glosses": [
        "(uncountable, games) A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "games"
      ]
    },
    {
      "categories": [
        "English countable nouns"
      ],
      "glosses": [
        "The footbag used for such a game."
      ],
      "raw_glosses": [
        "(countable) The footbag used for such a game."
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "wikipedia": [
    "Wham-O",
    "hacky sack"
  ],
  "word": "hacky sack"
}