"lower one's guard" meaning in English

{
  "forms": [
    {
      "form": "lowers one's guard",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "lowering one's guard",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "lowered one's guard",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "lowered one's guard",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "lower one's guard (third-person singular simple present lowers one's guard, present participle lowering one's guard, simple past and past participle lowered one's guard)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "antonyms": [
        {
          "word": "keep one's guard up"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "To become less guarded; to allow oneself to become more vulnerable."
      ],
      "id": "en-lower_one's_guard-en-verb-xBKD6OAp",
      "links": [
        [
          "guarded",
          "guarded"
        ],
        [
          "vulnerable",
          "vulnerable"
        ]
      ],
      "synonyms": [
        {
          "word": "drop one's guard"
        },
        {
          "word": "let one's guard down"
        }
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "to become less guarded",
          "word": "麻痺大意"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "mábìdàyì",
          "sense": "to become less guarded",
          "word": "麻痹大意"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "to become less guarded",
          "word": "herpaantua"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "to become less guarded",
          "word": "baisser la garde"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "to become less guarded",
          "word": "abbassare la guardia"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "to become less guarded",
          "tags": [
            "imperfective"
          ],
          "word": "usypiać czujność"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "to become less guarded",
          "tags": [
            "perfective"
          ],
          "word": "uśpić czujność"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "to become less guarded",
          "word": "bajar la guardia"
        }
      ]
    }
  ],
  "word": "lower one's guard"
}

{
  "forms": [
    {
      "form": "lowers one's guard",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "lowering one's guard",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "lowered one's guard",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "lowered one's guard",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "lower one's guard (third-person singular simple present lowers one's guard, present participle lowering one's guard, simple past and past participle lowered one's guard)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "antonyms": [
        {
          "word": "keep one's guard up"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English verbs",
        "Mandarin terms with redundant transliterations"
      ],
      "glosses": [
        "To become less guarded; to allow oneself to become more vulnerable."
      ],
      "links": [
        [
          "guarded",
          "guarded"
        ],
        [
          "vulnerable",
          "vulnerable"
        ]
      ],
      "synonyms": [
        {
          "word": "drop one's guard"
        },
        {
          "word": "let one's guard down"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "to become less guarded",
      "word": "麻痺大意"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "mábìdàyì",
      "sense": "to become less guarded",
      "word": "麻痹大意"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "to become less guarded",
      "word": "herpaantua"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "to become less guarded",
      "word": "baisser la garde"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "to become less guarded",
      "word": "abbassare la guardia"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "to become less guarded",
      "tags": [
        "imperfective"
      ],
      "word": "usypiać czujność"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "to become less guarded",
      "tags": [
        "perfective"
      ],
      "word": "uśpić czujność"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "to become less guarded",
      "word": "bajar la guardia"
    }
  ],
  "word": "lower one's guard"
}