"don't look now" meaning in English

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      "expansion": "don't look now",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
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          "_dis": "83 17",
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w+disamb"
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      "glosses": [
        "Used to alert the listener of danger, so that one may flee while the attacker thinks they are still unseen."
      ],
      "id": "en-don't_look_now-en-phrase-ZHoc~xpi"
    },
    {
      "categories": [],
      "examples": [
        {
          "text": "Oh, yeah? Well, don't look now, but we're on the grass!",
          "type": "example"
        },
        {
          "ref": "1986, Tom Armstrong, Marvin (comic)",
          "text": "Dad: You shouldn't be afraid of the ocean, Marvin. Just think of it as a giant bathtub.\nMarvin: Well, don't look now, but my rubber ducky just grew a fin.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used to point out something the speaker feels is obvious."
      ],
      "id": "en-don't_look_now-en-phrase-l3DqrQRp",
      "links": [
        [
          "sarcastic",
          "sarcastic"
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      "raw_glosses": [
        "(sarcastic) Used to point out something the speaker feels is obvious."
      ],
      "tags": [
        "sarcastic"
      ]
    }
  ],
  "word": "don't look now"
}

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      "expansion": "don't look now",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "glosses": [
        "Used to alert the listener of danger, so that one may flee while the attacker thinks they are still unseen."
      ]
    },
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      "categories": [
        "English sarcastic terms",
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      "examples": [
        {
          "text": "Oh, yeah? Well, don't look now, but we're on the grass!",
          "type": "example"
        },
        {
          "ref": "1986, Tom Armstrong, Marvin (comic)",
          "text": "Dad: You shouldn't be afraid of the ocean, Marvin. Just think of it as a giant bathtub.\nMarvin: Well, don't look now, but my rubber ducky just grew a fin.",
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        }
      ],
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        "Used to point out something the speaker feels is obvious."
      ],
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        [
          "sarcastic",
          "sarcastic"
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      ],
      "raw_glosses": [
        "(sarcastic) Used to point out something the speaker feels is obvious."
      ],
      "tags": [
        "sarcastic"
      ]
    }
  ],
  "word": "don't look now"
}