How to pronounce “muttering”(verb) in English

kind of like muttering to myself, and just looking around.

he was kind of mad always muttering to himself he walked around with bare feet in the snow and I thought I didn't have

Lemony: But last night the composer was not muttering, he was not humming, he was not moving or even breathing.

but other than that he's just kind of muttering and humming to himself like we all do.

off if you're walking too slowly, muttering under your breath.

Muttering under my breath.

And then, of course, you look, and over in the corner -- muttering to himself in Sanskrit -- is the 'genius' child.