"staircase lock" meaning in English

{
  "forms": [
    {
      "form": "staircase locks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "staircase lock (plural staircase locks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Canals",
          "orig": "en:Canals",
          "parents": [
            "Technology",
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A set of locks on a waterway canal which rise steeply, and consisting of lock gates where the top gate of one lock is also the bottom gate of the next lock, not having a pound between each level."
      ],
      "id": "en-staircase_lock-en-noun-1q6mSPYK",
      "links": [
        [
          "lock",
          "lock#Noun"
        ],
        [
          "canal",
          "canal#Noun"
        ],
        [
          "pound",
          "pound#Etymology_2"
        ]
      ]
    }
  ],
  "word": "staircase lock"
}

{
  "forms": [
    {
      "form": "staircase locks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "staircase lock (plural staircase locks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Canals"
      ],
      "glosses": [
        "A set of locks on a waterway canal which rise steeply, and consisting of lock gates where the top gate of one lock is also the bottom gate of the next lock, not having a pound between each level."
      ],
      "links": [
        [
          "lock",
          "lock#Noun"
        ],
        [
          "canal",
          "canal#Noun"
        ],
        [
          "pound",
          "pound#Etymology_2"
        ]
      ]
    }
  ],
  "word": "staircase lock"
}