"blast 'em up" meaning in English

{
  "forms": [
    {
      "form": "blast 'em ups",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blast 'em up (plural blast 'em ups)",
      "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": "topical",
          "langcode": "en",
          "name": "Video games",
          "orig": "en:Video games",
          "parents": [
            "Games",
            "Mass media",
            "Software",
            "Recreation",
            "Culture",
            "Media",
            "Computing",
            "Human activity",
            "Society",
            "Communication",
            "Technology",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1989, \"Silkworm\" (video game review) in Crash (issue 66, pages 24-25)",
          "text": "As destruction games go, Silkworm is fine. It's definitely a bit easy (I completed it after a dozen goes), but if you find the normal level of blast-'em-ups too difficult, this one should be rewarding. The two-player option is brilliant (one takes control of the jeep and the other the helicopter) and increases the addictivity."
        }
      ],
      "glosses": [
        "A shoot 'em up video game."
      ],
      "id": "en-blast_'em_up-en-noun-YZR4mEzG",
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "shoot 'em up",
          "shoot 'em up"
        ]
      ],
      "raw_glosses": [
        "(video games) A shoot 'em up video game."
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "blast 'em up"
}

{
  "forms": [
    {
      "form": "blast 'em ups",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blast 'em up (plural blast 'em ups)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Video games"
      ],
      "examples": [
        {
          "ref": "1989, \"Silkworm\" (video game review) in Crash (issue 66, pages 24-25)",
          "text": "As destruction games go, Silkworm is fine. It's definitely a bit easy (I completed it after a dozen goes), but if you find the normal level of blast-'em-ups too difficult, this one should be rewarding. The two-player option is brilliant (one takes control of the jeep and the other the helicopter) and increases the addictivity."
        }
      ],
      "glosses": [
        "A shoot 'em up video game."
      ],
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "shoot 'em up",
          "shoot 'em up"
        ]
      ],
      "raw_glosses": [
        "(video games) A shoot 'em up video game."
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "blast 'em up"
}