"sand timer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sand",
        "3": "timer"
      },
      "expansion": "sand + timer",
      "name": "compound"
    }
  ],
  "etymology_text": "From sand + timer.",
  "forms": [
    {
      "form": "sand timers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sand timer (plural sand timers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Clocks",
          "orig": "en:Clocks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Timekeeping",
          "orig": "en:Timekeeping",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An instrument for measuring the passage of time by the passage of sand through a narrow opening."
      ],
      "id": "en-sand_timer-en-noun-tUpVJcta",
      "synonyms": [
        {
          "word": "hourglass"
        }
      ]
    }
  ],
  "word": "sand timer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sand",
        "3": "timer"
      },
      "expansion": "sand + timer",
      "name": "compound"
    }
  ],
  "etymology_text": "From sand + timer.",
  "forms": [
    {
      "form": "sand timers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sand timer (plural sand timers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Clocks",
        "en:Timekeeping"
      ],
      "glosses": [
        "An instrument for measuring the passage of time by the passage of sand through a narrow opening."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "hourglass"
    }
  ],
  "word": "sand timer"
}