Muttered意思

"Muttered" is a verb that means to speak in a low, grumbling, or indistinct way, often to express discontent or to talk to oneself. It is typically used to describe someone speaking quietly and possibly incomprehensibly to others nearby. Here's an example sentence:

"He muttered something under his breath as he walked past, but I couldn't make out what it was."

In this sentence, "muttered" suggests that the person spoke in a way that was not meant for others to hear, and the listener was unable to understand the content of the speech.