"water off a duck's back" meaning in All languages combined

{
  "etymology_text": "From the idea that water rolls easily off a duck's back and does not penetrate the duck's feathers.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "water off a duck's back (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "She's always going on at him about something, but to him it's all water off a duck's back.",
          "type": "example"
        }
      ],
      "glosses": [
        "Something potentially harmful or hurtful, such as criticism or insult, that nevertheless has no effect or impact on the target."
      ],
      "id": "en-water_off_a_duck's_back-en-noun-SLbw3MCR",
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "water off a duck's back"
}

{
  "etymology_text": "From the idea that water rolls easily off a duck's back and does not penetrate the duck's feathers.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "water off a duck's back (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "She's always going on at him about something, but to him it's all water off a duck's back.",
          "type": "example"
        }
      ],
      "glosses": [
        "Something potentially harmful or hurtful, such as criticism or insult, that nevertheless has no effect or impact on the target."
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "water off a duck's back"
}