DuckCorp

DuckCorp Dico

(RFC 2229 compliant dictionary server)
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Found one definition 

  1.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                

    
                
                  
    mumble //ˈmʌmbəl// <v>
呟く, 囁く
to speak unintelligibly