Meaning of “nonsense word/syllable” in the English Dictionary

british dictionary

"nonsense word/syllable" in British English

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nonsense word/syllablenoun [ C ]

uk /ˈnɒn.səns ˌwɜːd/ us /ˈnɑːn.sens ˌwɝːd/ specialized

words or parts of words that do not exist in the language you are using:

The child repeated the nonsense syllables "boo di doo doo".

(Definition of “nonsense word/syllable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)