To hold one's breath and keep silent, usually out of reverence, awe, intense focus, or fear.
听到老师宣布比赛结果，所有学生都屏声息气地等待着。
Hearing the teacher announce the competition results, all the students held their breath, waiting silently.
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To hold one's breath and keep silent, usually out of reverence, awe, intense focus, or fear.