"chest up" meaning in English

{
  "forms": [
    {
      "form": "chests up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "chesting up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "chested up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "chested up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "chest up (third-person singular simple present chests up, present participle chesting up, simple past and past participle chested up)",
      "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 formed with \"up\"",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "To bump one's chest into (another person) aggressively; to physically challenge or confront."
      ],
      "id": "en-chest_up-en-verb-CzWkZWd2",
      "raw_glosses": [
        "(informal, transitive) To bump one's chest into (another person) aggressively; to physically challenge or confront."
      ],
      "tags": [
        "informal",
        "transitive"
      ]
    }
  ],
  "word": "chest up"
}

{
  "forms": [
    {
      "form": "chests up",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "chesting up",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "chested up",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "chested up",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "chest up (third-person singular simple present chests up, present participle chesting up, simple past and past participle chested up)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"up\"",
        "English transitive verbs",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "To bump one's chest into (another person) aggressively; to physically challenge or confront."
      ],
      "raw_glosses": [
        "(informal, transitive) To bump one's chest into (another person) aggressively; to physically challenge or confront."
      ],
      "tags": [
        "informal",
        "transitive"
      ]
    }
  ],
  "word": "chest up"
}