"knuckle under" meaning in English

{
  "forms": [
    {
      "form": "knuckles under",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knuckling under",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knuckled under",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "knuckled under",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "knuckle under (third-person singular simple present knuckles under, present participle knuckling under, simple past and past participle knuckled under)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English phrasal verbs with particle (under)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1907, John Galsworthy, chapter 8, in The Country House",
          "text": "\"Nothing shall induce me!\" he said. . . . \"The man is a ruffian. I won't knuckle under to him!\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To yield or cooperate when pressured or forced to do so."
      ],
      "id": "en-knuckle_under-en-verb-E6XnDQ35",
      "links": [
        [
          "yield",
          "yield"
        ],
        [
          "cooperate",
          "cooperate"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "force",
          "force"
        ]
      ],
      "raw_glosses": [
        "(intransitive, idiomatic) To yield or cooperate when pressured or forced to do so."
      ],
      "synonyms": [
        {
          "word": "fall in line"
        }
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ],
      "translations": [
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "Translations",
          "word": "doblar el espinazo"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-knuckle under.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/43/En-au-knuckle_under.ogg/En-au-knuckle_under.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/43/En-au-knuckle_under.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "knuckle under"
}

{
  "forms": [
    {
      "form": "knuckles under",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knuckling under",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knuckled under",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "knuckled under",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "knuckle under (third-person singular simple present knuckles under, present participle knuckling under, simple past and past participle knuckled under)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English intransitive verbs",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs with particle (under)",
        "English terms with audio links",
        "English terms with quotations",
        "English verbs",
        "Translation table header lacks gloss"
      ],
      "examples": [
        {
          "ref": "1907, John Galsworthy, chapter 8, in The Country House",
          "text": "\"Nothing shall induce me!\" he said. . . . \"The man is a ruffian. I won't knuckle under to him!\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To yield or cooperate when pressured or forced to do so."
      ],
      "links": [
        [
          "yield",
          "yield"
        ],
        [
          "cooperate",
          "cooperate"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "force",
          "force"
        ]
      ],
      "raw_glosses": [
        "(intransitive, idiomatic) To yield or cooperate when pressured or forced to do so."
      ],
      "tags": [
        "idiomatic",
        "intransitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-knuckle under.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/43/En-au-knuckle_under.ogg/En-au-knuckle_under.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/43/En-au-knuckle_under.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "fall in line"
    }
  ],
  "translations": [
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "Translations",
      "word": "doblar el espinazo"
    }
  ],
  "word": "knuckle under"
}