A sudden silence occurred ( among those present ) in an otherwise noisy setting. A hush fell over the audience as the famous pianist took the stage. a hush fell over someone or somethingFig. a sudden silence enveloped something or a group. As the conductor raised his arms, a hush fell over the audience. The coach shouted and a hush fell over the locker room.
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https://idioms. thefreedictionary. com/
همه یک دفعه ساکت شدند، همه با هم سکوت کردند، ناگهان سکوت حکم فرما شد، . . .