"throw for a loop" meaning in English

{
  "forms": [
    {
      "form": "throws for a loop",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "throwing for a loop",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "threw for a loop",
      "tags": [
        "past"
      ]
    },
    {
      "form": "thrown for a loop",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "throw<,,threw,thrown> for a loop"
      },
      "expansion": "throw for a loop (third-person singular simple present throws for a loop, present participle throwing for a loop, simple past threw for a loop, past participle thrown for a loop)",
      "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 terms with collocations",
          "parents": [
            "Terms with collocations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "really threw me for a loop;   threw us all for a loop"
        },
        {
          "ref": "1997 March, Ron Loutherback, “Beyond the Label: The ABCs of white wine”, in Orange Coast, volume 23, number 3, page 168",
          "text": "He thought he was up-to-date on all the latest wine lingo until a longtime wine writer returned his sample request card with a bold, hand-written note on it that stated, “Send me all samples—ABC!”\n“ABC” threw my friend for a loop. When he called me, I translated the cryptic phrase—ABC is winespeak for “Anything But Chardonnay.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of knock for a loop."
      ],
      "id": "en-throw_for_a_loop-en-verb-kHct6kKC",
      "links": [
        [
          "knock for a loop",
          "knock for a loop#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "knock for a loop"
        }
      ]
    }
  ],
  "word": "throw for a loop"
}

{
  "forms": [
    {
      "form": "throws for a loop",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "throwing for a loop",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "threw for a loop",
      "tags": [
        "past"
      ]
    },
    {
      "form": "thrown for a loop",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "throw<,,threw,thrown> for a loop"
      },
      "expansion": "throw for a loop (third-person singular simple present throws for a loop, present participle throwing for a loop, simple past threw for a loop, past participle thrown for a loop)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with collocations",
        "English terms with quotations",
        "English verbs"
      ],
      "examples": [
        {
          "text": "really threw me for a loop;   threw us all for a loop"
        },
        {
          "ref": "1997 March, Ron Loutherback, “Beyond the Label: The ABCs of white wine”, in Orange Coast, volume 23, number 3, page 168",
          "text": "He thought he was up-to-date on all the latest wine lingo until a longtime wine writer returned his sample request card with a bold, hand-written note on it that stated, “Send me all samples—ABC!”\n“ABC” threw my friend for a loop. When he called me, I translated the cryptic phrase—ABC is winespeak for “Anything But Chardonnay.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of knock for a loop."
      ],
      "links": [
        [
          "knock for a loop",
          "knock for a loop#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "knock for a loop"
        }
      ]
    }
  ],
  "word": "throw for a loop"
}