"grade-A" meaning in English

{
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      "expansion": "grade-A (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        {
          "ref": "1957 May, Jim Thompson, Alfred Hitchcock's Suspense Magazine, page 18, column 1:",
          "text": "And what they added up to was curtains - for him. He'd really stepped into something this time: a Grade-A jam, an honest-to-Hannah, double-distilled frammis.",
          "type": "quote"
        },
        {
          "ref": "2015, Adam Gallardo, Zombified, page 1:",
          "text": "Jesus, I was acting like a grade-A bitch, even if it was only in my head. I opened my eyes and tried to see the town in a more positive way.",
          "type": "quote"
        },
        {
          "ref": "2023 March 6, Alexis Jones, Megan Schaltegger, “These Tinder Conversation Starters Actually Work, According To Dating Experts”, in Women's Health:",
          "text": "If the conversation doesn’t progress (despite this grade-A advice), it’s probably not you. Now say that again—out loud, and in a mirror. To Hoggard Wagley’s point, the other person might have gone into the interaction with zero intention of actually meeting up.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of A-grade."
      ],
      "id": "en-grade-A-en-adj-EACS4BeP",
      "links": [
        [
          "A-grade",
          "A-grade#English"
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      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
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          "word": "A-grade"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "grade-A"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "grade-A (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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      "examples": [
        {
          "ref": "1957 May, Jim Thompson, Alfred Hitchcock's Suspense Magazine, page 18, column 1:",
          "text": "And what they added up to was curtains - for him. He'd really stepped into something this time: a Grade-A jam, an honest-to-Hannah, double-distilled frammis.",
          "type": "quote"
        },
        {
          "ref": "2015, Adam Gallardo, Zombified, page 1:",
          "text": "Jesus, I was acting like a grade-A bitch, even if it was only in my head. I opened my eyes and tried to see the town in a more positive way.",
          "type": "quote"
        },
        {
          "ref": "2023 March 6, Alexis Jones, Megan Schaltegger, “These Tinder Conversation Starters Actually Work, According To Dating Experts”, in Women's Health:",
          "text": "If the conversation doesn’t progress (despite this grade-A advice), it’s probably not you. Now say that again—out loud, and in a mirror. To Hoggard Wagley’s point, the other person might have gone into the interaction with zero intention of actually meeting up.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of A-grade."
      ],
      "links": [
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          "A-grade",
          "A-grade#English"
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          "word": "A-grade"
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      "tags": [
        "not-comparable"
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  "word": "grade-A"
}