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hum [hummed, humming, hums]▼(to produce low sounds which blend continuously)verb[UK: hʌm] [US: ˈhəm]
mumble [mumbled, mumbling, mumbles]▼(to speak unintelligibly)verb[UK: ˈmʌm.bl̩] [US: ˈmʌm.bl̩]
mutter [muttered, muttering, mutters]▼(speak incoherently)verb[UK: ˈmʌ.tə(r)] [US: ˈmʌ.tər]
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