"chugga" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "choo-choo"
      },
      "expansion": "choo-choo",
      "name": "m"
    }
  ],
  "etymology_text": "Imitative; compare choo-choo.",
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
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          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English onomatopoeias",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The sound made by a steam locomotive in motion."
      ],
      "id": "en-chugga-en-intj-kz2wTvWC",
      "links": [
        [
          "childish",
          "childish"
        ],
        [
          "sound",
          "sound"
        ],
        [
          "steam locomotive",
          "steam locomotive"
        ]
      ],
      "raw_glosses": [
        "(childish) The sound made by a steam locomotive in motion."
      ],
      "tags": [
        "childish"
      ]
    }
  ],
  "word": "chugga"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "choo-choo"
      },
      "expansion": "choo-choo",
      "name": "m"
    }
  ],
  "etymology_text": "Imitative; compare choo-choo.",
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "English childish terms",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English interjections",
        "English lemmas",
        "English onomatopoeias"
      ],
      "glosses": [
        "The sound made by a steam locomotive in motion."
      ],
      "links": [
        [
          "childish",
          "childish"
        ],
        [
          "sound",
          "sound"
        ],
        [
          "steam locomotive",
          "steam locomotive"
        ]
      ],
      "raw_glosses": [
        "(childish) The sound made by a steam locomotive in motion."
      ],
      "tags": [
        "childish"
      ]
    }
  ],
  "word": "chugga"
}