She muttered under her breath about the rude customer.
mutter darkly
Frequency:
60
%
He muttered darkly about the impending storm.
muttered complaint
Frequency:
45
%
He muttered a complaint about the noisy neighbors.
mutter incoherently
Frequency:
35
%
The drunk man muttered incoherently to himself on the street corner.
Idiomatic Expressions for mutter
Phrase: mutter sweet nothings
Meaning: to whisper affectionate or loving words to someone
Usage: He spent the evening muttering sweet nothings in her ear, trying to win her over.