you could hear a pin drop
US /juː kʊd hɪər ə pɪn drɒp/
UK /juː kʊd hɪər ə pɪn drɒp/

1.
鴉雀無聲, 寂靜無聲
used to describe a situation where there is complete silence, often due to tension or anticipation
:
•
When the teacher announced the test results, you could hear a pin drop in the classroom.
當老師宣布考試成績時,教室裡鴉雀無聲。
•
The audience was so captivated by the performance that you could hear a pin drop.
觀眾被表演深深吸引,鴉雀無聲。