"no more Mr. Nice Guy" meaning in English

{
  "etymology_text": "The phrase was originated by Walter Winchell in 1960. He wrote a syndicated show-business column in newspapers entitled On-Broadway, wherein he told a joke about Adolf Hitler using the phrase when the Soviets invaded Berlin in 1945. The phrase was later popularized in the Alice Cooper song of the same name.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "1973, Alice Cooper and Michael Bruce (lyrics and music), “No More Mr. Nice Guy”, in Billion Dollar Babies:",
          "text": "\"No more Mr. Nice Guy, No More Mr. Clean, No more Mr. Nice Guy, they say \"he's sick, he's obscene!\"\"",
          "type": "quote"
        },
        {
          "ref": "2003 August 19, \"Ed Anger\": Weekly World News, page 17:",
          "text": "You heard me right, buckaroos—no more Mr. Nice Guy. If those dagger-throwing Ali Babas are so keen on acting like the gol-durned Vietcong, I say let's treat 'em like the gol-durned Vietcong.",
          "type": "quote"
        },
        {
          "ref": "2007, Gene W. Kidd, Spotlight, →ISBN, page 141:",
          "text": "\"I'm outta here. Kian, watch yourself please,\" Bobby said.\n\"Bobby, watch yourself please,\" Kian said, sarcastic.\n\"That's it Kian. No more Mr. Nice Guy. Do not get in my way. You...\" Bobby said.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An implied individual has ceased being pleasant, and will now resort to unpleasant means to attain their objectives."
      ],
      "id": "en-no_more_Mr._Nice_Guy-en-phrase-w7huW~QC",
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        [
          "pleasant",
          "pleasant"
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      ],
      "related": [
        {
          "sense": "the",
          "word": "gloves are off"
        }
      ],
      "synonyms": [
        {
          "word": "no more Mr Nice Guy"
        },
        {
          "word": "no more Mister Nice Guy"
        }
      ],
      "wikipedia": [
        "Adolf Hitler",
        "Battle of Berlin",
        "No More Mr. Nice Guy (song)",
        "Walter Winchell"
      ]
    }
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  "word": "no more Mr. Nice Guy"
}

{
  "etymology_text": "The phrase was originated by Walter Winchell in 1960. He wrote a syndicated show-business column in newspapers entitled On-Broadway, wherein he told a joke about Adolf Hitler using the phrase when the Soviets invaded Berlin in 1945. The phrase was later popularized in the Alice Cooper song of the same name.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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    {
      "sense": "the",
      "word": "gloves are off"
    }
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      "examples": [
        {
          "ref": "1973, Alice Cooper and Michael Bruce (lyrics and music), “No More Mr. Nice Guy”, in Billion Dollar Babies:",
          "text": "\"No more Mr. Nice Guy, No More Mr. Clean, No more Mr. Nice Guy, they say \"he's sick, he's obscene!\"\"",
          "type": "quote"
        },
        {
          "ref": "2003 August 19, \"Ed Anger\": Weekly World News, page 17:",
          "text": "You heard me right, buckaroos—no more Mr. Nice Guy. If those dagger-throwing Ali Babas are so keen on acting like the gol-durned Vietcong, I say let's treat 'em like the gol-durned Vietcong.",
          "type": "quote"
        },
        {
          "ref": "2007, Gene W. Kidd, Spotlight, →ISBN, page 141:",
          "text": "\"I'm outta here. Kian, watch yourself please,\" Bobby said.\n\"Bobby, watch yourself please,\" Kian said, sarcastic.\n\"That's it Kian. No more Mr. Nice Guy. Do not get in my way. You...\" Bobby said.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An implied individual has ceased being pleasant, and will now resort to unpleasant means to attain their objectives."
      ],
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      "wikipedia": [
        "Adolf Hitler",
        "Battle of Berlin",
        "No More Mr. Nice Guy (song)",
        "Walter Winchell"
      ]
    }
  ],
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  "synonyms": [
    {
      "word": "no more Mr Nice Guy"
    },
    {
      "word": "no more Mister Nice Guy"
    }
  ],
  "word": "no more Mr. Nice Guy"
}