under your breath
C2 quietly so that other people cannot hear exactly what you are saying:
He muttered something under his breath.
Thesaurus: synonyms and related words
Silence & quiet
- breath
- hear
- hush
- hushed
- keep it down idiom
- keep sth down
- muffle
- muffled
- mute
- muted
- noiseless
- pindrop silence
- quiet
- quieten
- quietly
- radio silence
- silent
- trail
- trail away/off
- you could have heard a pin drop idiom
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