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

1.
鸦雀无声, 寂静无声
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.
当老师宣布考试成绩时,教室里鸦雀无声。
•
The audience was so captivated by the performance that you could hear a pin drop.
观众被表演深深吸引,鸦雀无声。