"let's say" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "let's say",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "ref": "2003 September 22, Michael Sincere, Understanding Stocks, McGraw Hill Professional, →ISBN, page 13:",
          "text": "... Let's say that a stock you're interested in, Bright Light, is cur- rently trading at $20 a share. You decide you ... Let's say you want to buy 1000 shares of a stock that is selling for $15 a share. How much will it cost you? The[…]",
          "type": "quote"
        },
        {
          "ref": "1953, ARTnews, page 39:",
          "text": "... Let's say you paint a stream . You look at the water . You see the different colors . Or you watch the sea - the waves . You see the different colors that you should use to paint them . \" Let's say your stream is flowing downhill . You[…]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Used to introduce a hypothetical."
      ],
      "id": "en-let's_say-en-phrase-Q1ZkMCNz"
    },
    {
      "categories": [
        {
          "_dis": "25 75",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "38 62",
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "32 68",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "19 81",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "24 76",
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "39 61",
          "kind": "other",
          "name": "Terms with Polish translations",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Used sarcastically to indicate that the next phrase is not meant seriously"
      ],
      "id": "en-let's_say-en-phrase-ctyTA9-A",
      "links": [
        [
          "sarcastically",
          "sarcastically#English"
        ]
      ],
      "translations": [
        {
          "_dis1": "16 84",
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "mettiamo che"
        },
        {
          "_dis1": "16 84",
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "metti che"
        },
        {
          "_dis1": "16 84",
          "code": "pl",
          "lang": "Polish",
          "sense": "Translations",
          "word": "powiedzmy"
        },
        {
          "_dis1": "16 84",
          "code": "sv",
          "lang": "Swedish",
          "sense": "Translations",
          "word": "anta att"
        }
      ]
    }
  ],
  "word": "let's say"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrases",
    "Entries with translation boxes",
    "Pages with 1 entry",
    "Pages with entries",
    "Terms with Italian translations",
    "Terms with Polish translations",
    "Terms with Swedish translations",
    "Translation table header lacks gloss"
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "let's say",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2003 September 22, Michael Sincere, Understanding Stocks, McGraw Hill Professional, →ISBN, page 13:",
          "text": "... Let's say that a stock you're interested in, Bright Light, is cur- rently trading at $20 a share. You decide you ... Let's say you want to buy 1000 shares of a stock that is selling for $15 a share. How much will it cost you? The[…]",
          "type": "quote"
        },
        {
          "ref": "1953, ARTnews, page 39:",
          "text": "... Let's say you paint a stream . You look at the water . You see the different colors . Or you watch the sea - the waves . You see the different colors that you should use to paint them . \" Let's say your stream is flowing downhill . You[…]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Used to introduce a hypothetical."
      ]
    },
    {
      "glosses": [
        "Used sarcastically to indicate that the next phrase is not meant seriously"
      ],
      "links": [
        [
          "sarcastically",
          "sarcastically#English"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "mettiamo che"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "metti che"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "Translations",
      "word": "powiedzmy"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "Translations",
      "word": "anta att"
    }
  ],
  "word": "let's say"
}