Submitted by György Chityil ... on Fri, 01/19/2018 - 20:39 Hierarchy: VerbDescription: {{context|transitive or intransitive}} To speak unintelligibly or inaudibly; to fail to articulate.Ngram: mumbleNgram Text: mumbleSource: WiktionaryIssue: 0Wiktionary tag: transitive or intransitiveNgram Count: 1