Definition of alphabet soup noun from the Oxford Advanced Learner's Dictionary

     

    alphabet soup

     noun
    noun
    BrE
     
    ; NAmE
     
    [uncountable]
     
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  1. 1(informal) language that is extremely difficult to understand, especially because it contains many symbols or abbreviations
  2. 2 soup that contains pasta in the shape of letters
  3. Word Origin early 20th cent.: alluding to a kind of clear soup containing pasta in the shapes of letters.
See the Oxford Advanced American Dictionary entry: alphabet soup