noun
gasp; under one's breath
Refers to a sharp intake of breath, often due to surprise, pain, or emotion. Can also describe speaking in a low, breathy voice.
彼女は驚いて息の下で小さく叫んだ。
She let out a small gasp under her breath in surprise.
息の下から「助けて」とつぶやいた。
He murmured 'help' under his breath.