"ground-stroke" meaning in English

{
  "forms": [
    {
      "form": "ground-strokes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground-stroke (plural ground-strokes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "groundstroke"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012 June 28, Jamie Jackson, “Wimbledon 2012: Lukas Rosol shocked by miracle win over Rafael Nadal”, in the Guardian",
          "text": "This set – the set of Rosol's life – was studded with aces and menacing ground-strokes that left Nadal an impotent spectator often muttering to himself and at the umpire regarding a perceived misdemeanour by his opponent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of groundstroke"
      ],
      "id": "en-ground-stroke-en-noun-uGs8cGzp",
      "links": [
        [
          "groundstroke",
          "groundstroke#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "ground-stroke"
}

{
  "forms": [
    {
      "form": "ground-strokes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground-stroke (plural ground-strokes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "groundstroke"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2012 June 28, Jamie Jackson, “Wimbledon 2012: Lukas Rosol shocked by miracle win over Rafael Nadal”, in the Guardian",
          "text": "This set – the set of Rosol's life – was studded with aces and menacing ground-strokes that left Nadal an impotent spectator often muttering to himself and at the umpire regarding a perceived misdemeanour by his opponent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of groundstroke"
      ],
      "links": [
        [
          "groundstroke",
          "groundstroke#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "ground-stroke"
}