"French triangle" meaning in English

{
  "forms": [
    {
      "form": "French triangles",
      "tags": [
        "plural"
      ]
    }
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  "head_templates": [
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      "args": {},
      "expansion": "French triangle (plural French triangles)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1897, The Theatre, p. 299, 1 May",
          "text": "It is another play of the “French triangle” type, but sordid in incident and unrelieved by gleams of wit or humour."
        },
        {
          "bold_text_offsets": [
            [
              46,
              61
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          "ref": "1922 February 2, James Joyce, “[Episode 9: Scylla and Charybdis]”, in Ulysses, Paris: Shakespeare and Company […], →OCLC, part II [Odyssey], page 205:",
          "text": "You have brought us all this way to show us a French triangle.",
          "type": "quotation"
        },
        {
          "ref": "1963, Orient, vol. 5, p. 74",
          "text": "The new French triangle—you might as well get used to it because you are going to see a lot of it—is husband, wife, and car."
        }
      ],
      "glosses": [
        "A love triangle; a ménage à trois."
      ],
      "id": "en-French_triangle-en-noun-ovAKAu8m",
      "links": [
        [
          "love triangle",
          "love triangle"
        ],
        [
          "ménage à trois",
          "ménage à trois"
        ]
      ]
    }
  ],
  "word": "French triangle"
}

{
  "forms": [
    {
      "form": "French triangles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "French triangle (plural French triangles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1897, The Theatre, p. 299, 1 May",
          "text": "It is another play of the “French triangle” type, but sordid in incident and unrelieved by gleams of wit or humour."
        },
        {
          "bold_text_offsets": [
            [
              46,
              61
            ]
          ],
          "ref": "1922 February 2, James Joyce, “[Episode 9: Scylla and Charybdis]”, in Ulysses, Paris: Shakespeare and Company […], →OCLC, part II [Odyssey], page 205:",
          "text": "You have brought us all this way to show us a French triangle.",
          "type": "quotation"
        },
        {
          "ref": "1963, Orient, vol. 5, p. 74",
          "text": "The new French triangle—you might as well get used to it because you are going to see a lot of it—is husband, wife, and car."
        }
      ],
      "glosses": [
        "A love triangle; a ménage à trois."
      ],
      "links": [
        [
          "love triangle",
          "love triangle"
        ],
        [
          "ménage à trois",
          "ménage à trois"
        ]
      ]
    }
  ],
  "word": "French triangle"
}