(you) could hear a pin drop

to be extremely quiet.

The new sound-proof lab is so well designed, you can hear a pin drop.

You could have heard a pin drop for a full minute after every song and then the audience would clap wildly.

• hit the deck
• hit the dirt
• hit the ground running
• hit the hay
• hit the headlines
• hit the jackpot
• hit the mark
• hit the nail on the head
• hit the panic button
• hit the right note
• hit the road
• hit the roof
• hit the sack
• hit the skids
• hit the something mark
• hit the spot
• hit the wall
• hit up
• hit where it hurts
• hit where it hurts most
• hit you between the eyes
• hit you like a ton of bricks
• hit you right between the eyes
• hit your stride
• Hobson's choice