"hammer blow" meaning in English

{
  "forms": [
    {
      "form": "hammer blows",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "hammerblow",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hammer blow (plural hammer blows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A blow with a hammer."
      ],
      "id": "en-hammer_blow-en-noun-qnAuvkb0"
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "1 99",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "3 97",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "3 97",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1959 September, P. Ransome-Wallis, “The British Railways Class \"9\" 2-10-0s”, in Trains Illustrated, page 419:",
          "text": "The balancing of the engine is unusual, with the rotating masses fully balanced and 40 per cent of the reciprocating masses statically balanced by lead weights in the coupled wheels; the reciprocrating balance weights are in the same phase on both sides of the engine. This system saves balance weight and reduces the wheel hammer-blow.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts."
      ],
      "id": "en-hammer_blow-en-noun-NTzusK9Z",
      "links": [
        [
          "rail transport",
          "rail transport"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "hammer blow"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "hammer blows",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "hammerblow",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hammer blow (plural hammer blows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A blow with a hammer."
      ]
    },
    {
      "categories": [
        "English terms with quotations",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1959 September, P. Ransome-Wallis, “The British Railways Class \"9\" 2-10-0s”, in Trains Illustrated, page 419:",
          "text": "The balancing of the engine is unusual, with the rotating masses fully balanced and 40 per cent of the reciprocating masses statically balanced by lead weights in the coupled wheels; the reciprocrating balance weights are in the same phase on both sides of the engine. This system saves balance weight and reduces the wheel hammer-blow.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "hammer blow"
}