Mutter
/mˈʌtər/
Listen pronunciation
Definition
(noun) A repressed or obscure utterance; an instance of muttering.
Sentence Examples
Don't mutter to yourself under your breath, but speak clearly and distinctly.
Paul heard Amelia mutter: "Oh, shit!"
CEFR Practice Quiz
I saw the old man ____ something under his breath as he walked away, but I couldn't quite hear the words he was saying to himself.