under your breath
低声说、私下嘀咕
口语·表达低声抱怨或嘀咕
英文释义
to say something quietly or in a hushed tone, often out of anger or frustration, so that others may not hear
例句
He muttered an insult under his breath so no one else could hear.
典故来源
字面意为在呼吸之下，指声音极低，几乎被呼吸声掩盖。