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moo [mooed, mooing, moos]▼(to make a lowing sound)
verb
[UK: muː] [US: ˈmuːː]

murmur [murmured, murmuring, murmurs]▼(to say something indistinctly, not necessarily in a low voice)
verb
[UK: ˈmɜː.mə(r)] [US: ˈmɝː.mər]