under breath

Related to under breath: fall short, slink around, so much for

under (one's) breath

Spoken in such a soft, quiet voice that others cannot hear it distinctly. "You'll get what's coming to you one of these days," Janet muttered under her breath.
See also: breath
Farlex Dictionary of Idioms.

*under one's breath

Fig. [spoken] so softly that almost no one can hear it. (*Typically: curse ~; curse some-one or something ~; mutter ~; mutter something ~; say something ~.) John was muttering something under his breath, and I don't think it was very pleasant. I'm glad he said it under his breath. If he had said it out loud, it would have caused an argument.
See also: breath
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • under (one's) breath
  • under one's breath
  • under your breath
  • curse (someone) under (one's) breath
  • mutter
  • mutter (something) under (one's) breath
  • with every (other) breath
  • with every breath
  • that will do
  • below (one's) breath