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mutter
mastery UK /ˈmʌtə/ US /ˈmʌtɚ/verbnounname
card 1 of 10 · fill in the blank
He was heard to _____ mutter complaints about the slow service while waiting in line at the café.
card 1 of 10 · fill in the blank
He was heard to _____ mutter complaints about the slow service while waiting in line at the café.