"thank-you-ma'am" meaning in English

{
  "etymology_text": "Named in allusion to the sudden bobbing of the head of a person crossing it in a vehicle, similar to a curtsey.",
  "forms": [
    {
      "form": "thank-you-ma'ams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "thank-you-ma'am"
      },
      "expansion": "thank-you-ma'am (plural thank-you-ma'ams)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Roads",
          "orig": "en:Roads",
          "parents": [
            "Road transport",
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A ridge or hollow across a road."
      ],
      "id": "en-thank-you-ma'am-en-noun-naOOuP9o",
      "links": [
        [
          "ridge",
          "ridge"
        ],
        [
          "hollow",
          "hollow"
        ],
        [
          "road",
          "road"
        ]
      ],
      "related": [
        {
          "word": "wham, bam, thank you ma'am"
        }
      ]
    }
  ],
  "word": "thank-you-ma'am"
}

{
  "etymology_text": "Named in allusion to the sudden bobbing of the head of a person crossing it in a vehicle, similar to a curtsey.",
  "forms": [
    {
      "form": "thank-you-ma'ams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "thank-you-ma'am"
      },
      "expansion": "thank-you-ma'am (plural thank-you-ma'ams)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "wham, bam, thank you ma'am"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Roads"
      ],
      "glosses": [
        "A ridge or hollow across a road."
      ],
      "links": [
        [
          "ridge",
          "ridge"
        ],
        [
          "hollow",
          "hollow"
        ],
        [
          "road",
          "road"
        ]
      ]
    }
  ],
  "word": "thank-you-ma'am"
}