pin-drop
adjective [ before noun ] uk/ˈpɪnˌdrɒp/ us/ˈpɪnˌdrɑːp/
大头针掉在地上（用来强调非常安静）
used for emphasizing that a place, group of people, etc. is extremely quiet
When she rose to speak, there was pin-drop silence.
It was midnight and the arena was deserted and pin-drop quiet. 已是午夜，竞技场空无一人，静得可以听到针落脚下。
- More examples
- The crowd stayed pin-drop silent while he played.
- The speaker's remarks brought the students to pin-drop silence.
- Silence of the pin-drop variety prevailed.
- At certain points the music collapses to pin-drop volume.
- It would be difficult to imagine a bolder way of establishing a mood of pin-drop intimacy.