"自言自语" (zì yán zì yǔ) is a Chinese phrase that means "to talk to oneself" or "to mutter to oneself." In Engpsh, a common phrase for this is "to talk to oneself" or "to mutter to oneself."
Here are a few other phrases that might be used to describe the same behavior:
To mutter under one's breath
To mumble to oneself
To soploquize
To soploquy
For example, you might say "I caught myself muttering to myself while I was working on a difficult problem" or "I saw someone talking to themselves on the street and I wondered if they were okay."
Here are a few other phrases that might be used to describe the same behavior:
To mutter under one's breath
To mumble to oneself
To soploquize
To soploquy
For example, you might say "I caught myself muttering to myself while I was working on a difficult problem" or "I saw someone talking to themselves on the street and I wondered if they were okay."