What is another word for say under breath?
Pronunciation: [sˈe͡ɪ ˌʌndə bɹˈɛθ] (IPA) 
Say under breath is a phrase used to describe speaking quietly or mumbling in a way that is difficult to hear or understand. There are several synonyms for this phrase, including mutter, murmur, whisper, mumble, and grumble. Each of these words carries a slightly different connotation, with mutter and grumble suggesting annoyance or displeasure, while whisper and murmur suggest a more hushed or secretive tone. Mumble is a more neutral term that simply describes speaking indistinctly or quietly. No matter which synonym you choose, the underlying meaning remains the same - someone is speaking softly or quietly, either intentionally or unintentionally.
