To assume a serious and subdued demeanor, holding one's breath, often out of respect, caution, or apprehension, not daring to act presumptuously.
当老师傅讲解精湛技艺时，学徒们都敛色屏气，生怕错过任何一个细节。
When the master craftsman explained his exquisite skill, the apprentices all assumed a serious demeanor and held their breath, fearing they might miss any detail.
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